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Author Topic: Speeding reduces gas mileage per gallon. Back to Topics
tazdriver

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Message Posted: Dec 31, 2007 10:38:27 AM

Must be some state of denial (not talking about some place in Egypt) when we speed and at the same time complain about high gas prices. It has been shown time and time again that slowing down could single handedly cut in half the amount of gasoline we consume. So why do we speed?
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 27, 2014 9:55:03 AM

I just pick my "sweet spot speed" and go with that, even the cruise system likes it on the multi-lanes/mild up-grades, whatever. Seldom use the CC... during two lane, one each way too many distractions when traffic is heavier.

Can I save fuel by staying near the limits, You Betcha! but that varies with road conditions. Also each vehicle is or has a bit different speed range for economy, always close but not the same.
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Valandingham
Champion Author Washington

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Message Posted: Sep 27, 2014 7:55:33 AM

Doesn't anyone ever take and do a MPG test with their Vehicle between a daily commute of stop and go and not so daily commute of Cruise Control and compare?

Did anyone take a good look at the difference between the MPG Ratings of City (35 MPH Average Speed) and Highway (60 MPH Average Speed)? I believe that the city driving is where you use more Fuel per Mile than Highway.

Don't you notice that on Cruise Control at Higher Speeds, weather your going at the speed limit or just a little bit above it, it does go into an ideal if the speed goes faster or on a downhill slope and the engine speed picks up if you speed drops or you start uphill. This increase is only to maintain the speed you set for your cruise control and goes save you fuel.
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StArrow68
Champion Author Oakland

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Message Posted: Sep 27, 2014 4:57:30 AM

When on short trips, plan ahead so you aren't rushed. On long trips, multi day drives, saving an extra hour or more behind the wheel is worth a lot. Enjoy what you drive, we do.
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twt
Champion Author Virginia Beach

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Message Posted: Sep 27, 2014 4:44:05 AM

DUH, Gee, faster means less mileage. DUH
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HotRod10
Champion Author Wyoming

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Message Posted: Sep 26, 2014 6:03:51 PM

Pinbuster: "That means by driving the speed limit I'm using 95.7 gallons less fuel for the year and at a current average price of $3.43/gal that's a savings of $328.25 in fuel cost a year"

...and 60 hours of your life. As long as your time is worth less than $6 an hour, then it's worth it.
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KansasGunman
Champion Author Kansas

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Message Posted: Sep 21, 2014 7:40:03 AM

Duh, ya think?
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Safari7350
Sophomore Author Illinois

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Message Posted: Sep 21, 2014 2:31:46 AM

I try not to speed.
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badbobKY
All-Star Author Lexington

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Message Posted: Sep 21, 2014 1:28:45 AM

yes
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MsPeachi747
Veteran Author Cleveland

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Message Posted: Sep 20, 2014 7:30:07 PM

City driving and speeding above speed limit does reduce gas mileage. Highway gas mileage is better than city stop and go scenarios.
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Awing1
Champion Author Ontario

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Message Posted: Sep 11, 2014 8:03:26 AM

Not true up to certain speed, but it's true at very high speed.
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 11, 2014 7:39:14 AM

When other traffic is not a problem, I sometimes press ahead of my cruise control setting when passing, mostly on slight downgrades, then ease off the pedal, also when starting motion, a quicker punch on the go pedal in first gear/second gear only to then ease back as my vehicle winds at a slower rate toward my travel speed.

Valandingham, mentioned He does that similar driving habit to reduced the time interval of being in each lower gearing ratio while winding up gradually to His travel speed of top gearing/travel speed.

Well that works as a fuel saver, when I drive our economy vehicles, because they both have a high rear axle torque produced by a really low 1st. gear ratio, plus 2nd.gear is a close torque producer.fo my smaller engines. I can tell by viewing the Tach(RPMs).

I don't know what He drives or His engine size, but My larger older vehicles engines all with automatics don't share that advantage on quick is better than winding slower on acceleration attempts.

One reason is the older engines doesn't have as much ECM on the go mainly VC-Timing, and not as much ECM....control E..tuning as I drive different speed ranges while in the lower gears of the auto tranny, each start motion.

Talking Quicker Torque is not saying I peel out, or stomp the go pedal, but more of a brisk effort to take advantage of the designed first two tranny gears on my lower low-end gearing economy vehicles. The less weight factor is important for small engines to take that torque advantage and still save fuel doing so....(another trick driving technique)Not Wild!
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hoopitup2000
Champion Author Virginia

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Message Posted: Sep 11, 2014 6:29:49 AM

Yes speeding is an epedemic. Most of those speeders need to get laid & calm down when behind wheel.
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GLM4205
Champion Author Toledo

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Message Posted: Sep 11, 2014 5:42:16 AM

I argee with Valandingham.
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pinbuster2005
Champion Author New Hampshire

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Message Posted: Sep 11, 2014 4:28:05 AM

I don't know about other people but I have personally tested this going back and forth to work. Since I drive 54 miles round trip every day and 95% of it is on roads that are speed limit 55 or 65. With my current automobile if I do this going the speed limit I average 22.6 mpg in fuel economy. If I drive 5-10 mph over the speed limit my fuel economy drops to 20.8 mpg on average. Sure that doesn't sound like a big difference but over the course of a year (25k miles total driving) that makes a difference of using 1106.2 gallons driving the speed limit or using 1201.9 gallons going 5-10 mph over the speed limit. That means by driving the speed limit I'm using 95.7 gallons less fuel for the year and at a current average price of $3.43/gal that's a savings of $328.25 in fuel cost a year or $6.31 a week. It might not be a lot but it's still better in my pocket than the gas station's. Plus something else people don't think about is if you get caught speeding and get a ticket for it. Not only will you have to pay that fine but your auto insurance costs are going to go up for a few years adding more cost to your ride than just the extra your spending on gas.

[Edited by: pinbuster2005 at 9/11/2014 4:30:19 AM EST]
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dontuknowOH
Champion Author Ohio

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Message Posted: Sep 10, 2014 9:22:33 AM

I can only say that I've based my mileage gains on driving steady, staying off the brakes as much as possible, logically the more one opens the Go Pedal throttle and holds, the more fuel/air energy gets suck/forced into each Engine in order for it to respond.

The common utility emrg. generator system for any use >>> Specs. state the amount of fuel usage(gal./liters.) per amount of hours of running time under rated wattage loads. The closer one comes to adding extra device loads then brings the total wattage up toward MAXIMUM. <<<< That's fine but then the fuel consumption eats away run time, shortens the run until needing refueling.
And generators don't even speed(OEM designed for steady RPMs/currant frequency)is a must!

Vehicles on the road a bit similar(by having ICE, total weight, heavy or not, aerodynamic on not, all reach their maximum point in cruising speed with cruise control on/off, Maximum for Economy, naturally other conditions prevail such as hills, slowing, braking, even speeding to meet deadlines.

You mentioned that when the cruise system backs off going down hills or the driver backs off the go pedal, "replying" there is a difference, the cruise doesn't always go back to idle position on fuel consumption each time.

Talking heavy trucks heavy loaded non aerodynamic, they probably do, because of the heavy rolling total weight/momentum and gravity and many wheels turning in dynamic motion(flywheel action) That requires a very good brake system or compression braking(idle response)included >>> as you mentioned. Still they often don't back off always to the minimum idle position. Some slow-downs yes.

FEG readouts on lighter vehicles can show the engines drop-off in fuel energy/engine power levels (economy) even when the C.C. is on even on very slight downgrades, hills, or when a tail/headwind affects traveling motion of the vehicle.

I see your point as far as slowing for another vehicle for what ever reason, but isn't that part of driving just like attempting to speed to make up time, I see it as depending on what one drives (type vehicle) and when/where.....? Same as I/others, will never know how fast or soon you want to reach your engine off interval break, Whatever, ETC.

You may want to consider that most ICE power-plants are really a large pumping invention, controlled by a Driver's Foot, and then any speeding up of that ICE Pump will flow not only power output <<< its main purpose but also flow in more air/fuel, your choice, depending..... HAGDay!
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Valandingham
Champion Author Washington

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Message Posted: Sep 10, 2014 6:37:01 AM

dontuknowOH The only way speeding reduces fuel economy is when you have to SLOW DOWN for the idiot who is traveling SLOWER THAN THE POSTED SPEED LIMIT IN FRONT OF YOU. If you have your Cruise Control set above the posted speed limit in some vehicles I have noticed that when the vehicle is traveling at cruising speed or on a down hill slope the engine ideals until you either start going below the cruising speed or uphill.
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dchawk81
Sophomore Author Pennsylvania

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Message Posted: Sep 10, 2014 12:22:15 AM

Well I get paid $60 an hour when working and nothing when not, so it behooves me to haul ass every now and then when I'm getting between locations on a job.

But I don't do so at the expense of safety and I cruise just a few MPH over the posted limit to get home to save some gas.
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carinthuist
Champion Author San Francisco

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Message Posted: Sep 9, 2014 5:26:19 PM

yes
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krazkar
Champion Author Calgary

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Message Posted: Sep 9, 2014 11:22:41 AM

I don't care. Raise the speed limits and I won't 'speed' as often!
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redfish67
Champion Author Dallas

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Message Posted: Sep 9, 2014 10:20:51 AM

duh!!
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twt
Champion Author Virginia Beach

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Message Posted: Sep 9, 2014 8:29:06 AM

Common sense.
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TheRealDeal78
Champion Author Bakersfield

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Message Posted: Sep 9, 2014 2:07:19 AM

I find it interesting that I get better mpg if I drive 80 on the interstate vs 70. I average 3 to 4 mpg higher.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 13, 2014 9:40:32 AM

It should by design. Like buying a Big Dog and getting Big Dog results!
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redfish67
Champion Author Dallas

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Message Posted: Jul 13, 2014 9:31:15 AM

it's a no brainer
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 13, 2014 9:29:44 AM

Valandingham: The self driving test you refer to, rather several and then that comparison, for finding a better Idea/way to save fuel has merit.

I have done on occasion a few practices with my econo ride, but the real results that counts is a combination of a lot of improved habits/and concentration when driving. That doesn't always happen on a regular basis by the average driver.

I find staying aware of Engine run time V/S destination mileage, each time, per each startup/start off and affected by traffic often puts a clamp on the fuel costs, and increasing them. Add bad driving habits to that mix leaves the results messed at times.

I call the Idea that you mentioned to save fuel no pun intended, I call it the Elephant/Horse Engine game which is effected by time intervals of the engine's energy use.

The elephant being the E..torque limits and the horse being the engines quick power ability, which builds at the upper rpm range, with both using up fuel to please the driver choice commands driving the vehicle.

Every day driving requires many encounters with varied conditions for saving a bit of fuel. Most know elephants are powerful lugging beasts but somewhat slow energy and a horse can deliver moderate power with more speed. The ICE gas engine by comparison has both qualities with out feeding them fuel when idle.

Engines deliver harmony power if the driver learns what correct practices are needed for that average choice of use is overall the time interval of travel with>>> the Engine on till >>> engine turns off, satisfied Happy Driver(very good choices) $$ saved at the next refuel! Testing is a good Idea.... HABDay! (Better)!....
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gougedQC
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Message Posted: Jul 13, 2014 9:06:28 AM

no housckster- it is not untrue- along the lines of what- dontuknow= posted, different vehicles have different optimum speed-consumption rates.

I would venture a Porsche gets better mileage at 75 than 55 whereas a ford 350 pickup probably is the opposite

BTW- top gear tested a Prius and a big BMW around a race track..with the prius leading as fast as it could and the dimmer M3 following... after one gallon (imp) the prius ran out and the Bimmer kept going

now reduce that speed to 55 (snore) and the prious would probably win.. but the point is proven
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Valandingham
Champion Author Washington

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Message Posted: Jul 12, 2014 6:22:39 PM

The thing that I have found is that if you use MORE fuel traveling SLOWER to keep the slower speed taking more time to get somewhere than if you were traveling at a much HIGHER SPEED taking Less Time to get somewhere and using LESS FUEL.
The same goes if you take your time to get up to speed from a stop you use MORE FUEL over a LONGER DISTANCE and TIME than if you Put you foot down and get up to speed on a Shorter distance and time which uses LESS FUEL.

The best way to test this out is to take a long road trip at a constant speed limit of 60, 65 or 70 depending on the U.S. state or Canadian Providence your in with Cruise Control being used over the weekend. And try the same thing without Cruise Control in the Weekly Grind of Rush Hour Traffic and see how much MORE FUEL you use.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 30, 2014 10:12:32 PM

I think about motorized vehicles and their engine fuel/power efforts as similar to ones Human energy exerted when riding a multispeed bicycle.If you have ever ridden a bike that has gearing changes often you often pick one out of 5 speeds to cruise at. You will find a top gear that is right in pedal speed, then pressure force exerted for whatever resistive forces encountered, and that may change as you ride.

The same is true with automotive designs, Engineers pick an optimum high gear for most average midrange travel speeds when engine torque is near it's peak but with a percentage of reserve for an over-drive top cruise gearing when conditions permit.

Level terrain, moderate load, only slight towing, minimum highway speed, all pertain to the engines best breathing/torque/harmony = best fuel economy with a slight reserve of pulling a taller final gear ratio like over-drive.

My opinion is often there is possibly better mileage with less engine effort thus fuel savings is determined by The vehicles ECM tested levels when designed, for each type vehicle/application.(averaging road conditions)per drivetrain/final top gearing matched to each engine's energy power.

You decide what matches your energy levels of Human power when riding the multi-speed bicycle by selecting the proper gear, this affects your average travel speed while pedaling. Sometimes you use your reserve and sweat a little, breath harder, coast to recover, and how is your tank doing? Food/Drink Tank! What gear choice? for cruising Harmony("Sweet Spot Speed") !!
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luvmyrv
All-Star Author Winnipeg

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Message Posted: Jun 30, 2014 4:49:04 PM

You could say the same thing about many things in life....smoking increases risk of cancer, why do people do it? Too much take out and fast food can lead to obesity, why do people continue to supersize their order?
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PhilnTX
All-Star Author Dallas

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Message Posted: Jun 30, 2014 4:35:29 PM

OK
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eyegotgas2
Champion Author British Columbia

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Message Posted: Jun 30, 2014 3:02:50 PM

Everybody knows it but we do it to save on time generally or to some it has become a habit
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Houckster
Champion Author Atlanta

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Message Posted: Jun 30, 2014 1:20:56 PM

AWING1 writes: Yes, that's right, but if you drive at constant high speed (eg. 75 mph etc) on the highway, it would be better than city driving (because of stopping and going).
______
You really can't compare city and highway driving. It's like apples and oranges.

When the car reaches top gear or OD, that's where the question really is. Some people will contend, for example, that by driving 65 as opposed to 55, they get better mileage. This is untrue. As vehicle speed increases so does wind resistance and vehicle RPM. One possible exception might be for a vehicle with cylinder deactivation but when the key variables are held constant except for speed, 55 MPH will yield better mileage than 65 MPH.

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GLM4205
Champion Author Toledo

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Message Posted: Jun 30, 2014 12:49:24 PM

Sure it does.
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twt
Champion Author Virginia Beach

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Message Posted: Jun 28, 2014 3:04:00 AM

DUH, the faster your engine is running, the more fuel is consumed.
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dontuknowOH
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Message Posted: Jun 27, 2014 10:09:56 PM

Weaslespit is right about the 10 mph cruising speed being a dud for decent mileage.

Vehicles at that speed are turning great amounts of rpm in relation to ground travel in distance, low rpms maybe but lots, great amounts!

Also a vehicle would not be able to correctly cool itself, coolant fans would run heavily then causing large amounts of alternator load (wasting fuel)that way.

Then the transmission also would stay in a 1st. or 2nd. gearing mode with more heat build-up, so Extreme Pokey would be risky, waste fuel, cause mechanical harm to the vehicle, and look really dumb to be on the roadway if no running in a crippled condition(Flashers in use)constantly.

My good range is 60-67 MPH. for economy, and that varies with road conditions/atmosphere/ amount of accessories in use.
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Weaslespit
Champion Author Cincinnati

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Message Posted: Jun 25, 2014 9:52:07 AM

"Amen, NO vehicle gets better mpg as mph increases;"

This statement is untrue. You do not get better gas mileage cruising at 10 mph than at 65 mph... It is all about the gearing - you get the best gas mileage in your highest gear. Where in the curve maximum mpg is attained relative to speed/power is dependent on the vehicle.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 25, 2014 9:33:51 AM

It surely must be hard for some to understand that vehicles are designed to use more fuel when their engines are required to work harder at higher RPMs or when coupled to a too tall gearing ratio which depends on the terrain traveled, extra head wind, stop/go inertia forces, extra weight loads, other resistive forces.

Some drivers learn what their vehicle's Harmony (Sweet Spot Speed)is and then go with that, others don't care even though they drive somewhat of an economy vehicle they often push it to their $... affordable limits/habits.

Some are Dense to saving fuel(don't know just what to do)to improve their mileage, and often get the Horn blasts heard daily directed toward them, Really!?? Blasts are different than toots HMmmmm....
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herbiepopnecker
Champion Author British Columbia

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Message Posted: Jun 24, 2014 10:56:13 PM

Because of weather conditions I had to drive home at 80kph (50) instead of my regular 110kph (70).
Next morning I fired up the car and saw the gas gauge ant thought 'there's way too much gas left after that trip!"
Amazing the difference speed makes.
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kxy4fw
Champion Author Denver

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Message Posted: Jun 24, 2014 1:26:42 PM

???
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the1roadhog
Champion Author Atlanta

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Message Posted: Jun 24, 2014 8:06:37 AM

No kidding????
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Awing1
Champion Author Ontario

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Message Posted: Jun 24, 2014 7:56:07 AM

Yes, that's right, but if you drive at constant high speed (eg. 75 mph etc) on the highway, it would be better than city driving (because of stopping and going).
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luxette007
Rookie Author Long Island

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Message Posted: Jun 24, 2014 6:23:45 AM

Simply enough: impatience, time-constraints, people wanting and needing to get to where they're going on time or early. Plenty of arguments to be made for making extra time before getting on the road so one can drive slowly and allow for traffic (easier said than done, usually) but people are only concerned about gas when a) they're running low and/or b) they aren't able to get much of it. En route to work, an appointment, a function, or even just home for the day is rarely where you think "drive slow, save gas".
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twt
Champion Author Virginia Beach

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Message Posted: Jun 24, 2014 5:38:53 AM

We speed, because we're stupid.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 23, 2014 8:36:42 PM

They need to call the Go pedal the "Slurp Pedal" and the brake pedal the Has Been pedal....
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texaskellys
Rookie Author Houston

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Message Posted: Jun 22, 2014 1:05:06 PM

Amen, NO vehicle gets better mpg as mph increases; #1 factor in mpg is still wind resistance, even in modern aerodynamic design (point taken in the comment about the Corvette).

Why we speed is an altogether different question, which, unfortunately like why we still have famine in the middle of abundance, poverty with so much wealth, watt and a host of other issues. Too many of is are concerned with "me" instead of "we."
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 20, 2014 2:25:46 AM

I believe its suppose to, things being normal. Its the excitement that drops any concern and the valuable time gained back to ones person use. There are some that don't waste a moment of time, I get it!.......
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thebrohta167
Champion Author New Jersey

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Message Posted: Jun 19, 2014 1:58:07 PM

ok
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StArrow68
Champion Author Oakland

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Message Posted: Jun 19, 2014 12:16:24 PM

Some seem to confuse speeding with speed. Speed is what gets you to your destination in a reasonable amount of time and if you want to spend more time and less on fuel you can drive below the limits. Speeding is presumably exceeding those limits and risks getting the attention of the law and costing you much more than the slight amount of additional fuel you consume.
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lostsoul
All-Star Author Los Angeles

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Message Posted: Jun 19, 2014 11:41:18 AM

without a doubt
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dontuknowOH
Champion Author Ohio

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Message Posted: Jun 19, 2014 7:46:31 AM

Yes because your vehicle is designed to produce more power when you the driver pushes the go-pedal farther down. Actually you turn the go fast fuel faucet system to a more opened position to create that extra engine energy.

There is always a harmony speed where the engine, aerodynamics, wind, rolling friction, gearing comes into balance for a cruising travel speed
that is the most economical, and that speed varies among vehicles and road conditions, Drivers habits mostly have the greater affect on mileage.....
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