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Author Topic: Anyone shifting to neutral on downhill to save gas ? Back to Topics
Vibe03

Veteran Author
Toronto

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Message Posted: Jul 21, 2010 9:12:55 AM

When it is not steep downhill and you don't need to brake the car to slow it down, coasting down around 55 mph at idling gives the engine a rest also save gas. Just not sure if the vacuum and other stuff are operating at normal level
REPLIES (newest first) Post a Reply
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OilerFan
Champion Author Tulsa

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Message Posted: Jul 28, 2014 7:40:26 AM

I do it all the time, but I drive a manual transmission, so it's not that big a deal.
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hoopitup2000
Champion Author Virginia

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Message Posted: Jul 28, 2014 6:30:09 AM

Rarely . . . .
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RalphHightower
Champion Author South Carolina

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Message Posted: Jul 28, 2014 5:52:28 AM

no
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Jay4Runner
Champion Author Oakland

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Message Posted: Jul 27, 2014 2:34:30 PM

I used to coast a lot but my commute has changed where it would not make a difference.
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Jetta_Pilot
Champion Author Toronto

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Message Posted: Jul 27, 2014 1:30:56 PM

Dumbest thing I ever heard of in an automatic tranny car !!
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 27, 2014 9:58:33 AM

DEFCO tune-up may be needed, when running oversize tires, check....even on level ground with non windy travel. Drastic total wheel size diameters may change your drive axle torque spec. and speedometer readings/motion dynamics. Barometric sensors seldom act up if not in the mountains or at sea level(power levels) will vary sometimes (towing). Tire pressure very important check all tires. HAGD!
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contiki
Champion Author Ontario

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Message Posted: Jul 27, 2014 7:29:17 AM

Never.....
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RalphHightower
Champion Author South Carolina

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Message Posted: Jul 27, 2014 6:50:26 AM

no
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Awing1
All-Star Author Ontario

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Message Posted: Jul 25, 2014 10:33:16 PM

No.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 25, 2014 10:21:58 PM

No hills ,but I did a neutral coast making 5 green lights at an even steady speed nearly 2.5 mile in the econo vehicle today. Traffic for a change was a Charm!
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dassfg
Champion Author Fort Worth

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Message Posted: Jul 25, 2014 8:19:18 AM

Never
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b899
Champion Author Connecticut

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Message Posted: Jul 25, 2014 8:01:37 AM

no
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jl1rp
Champion Author New Hampshire

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Message Posted: Jul 23, 2014 12:37:08 AM

no
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redfish67
Champion Author Dallas

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Message Posted: Jul 20, 2014 11:39:28 AM

no
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Awing1
All-Star Author Ontario

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Message Posted: Jul 20, 2014 10:11:32 AM

No,
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b899
Champion Author Connecticut

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Message Posted: Jul 20, 2014 9:39:04 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 20, 2014 7:07:06 AM

Never.....
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poetdog73
Champion Author Toledo

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Message Posted: Jul 19, 2014 10:02:20 PM

too busy driving
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FocusSVT
Champion Author Toronto

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Message Posted: Jul 19, 2014 5:16:33 PM

Practiced this for over 2 years now and can see the savings. My fuel
consumption went down a full liter per 100 km and the car is running ever
smooth. Over 11 years and over 1/4 million km. I use synthetic oil
religiously and never over 8000 km for oil change
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contiki
Champion Author Ontario

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Message Posted: Jul 19, 2014 7:40:35 AM

Never...........
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b899
Champion Author Connecticut

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Message Posted: Jul 19, 2014 6:49:12 AM

No
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b899
Champion Author Connecticut

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Message Posted: Jul 17, 2014 8:45:43 AM

no
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PaylessKY
Champion Author Kentucky

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Message Posted: Jul 15, 2014 11:09:53 AM

No
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contiki
Champion Author Ontario

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Message Posted: Jul 15, 2014 7:18:26 AM

Never........
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cv
Champion Author Raleigh

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Message Posted: Jul 14, 2014 5:53:04 AM

No need for the small savings in my case.
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ace12012
Champion Author Phoenix

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Message Posted: Jul 13, 2014 4:19:40 PM

no.
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redfish67
Champion Author Dallas

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Message Posted: Jul 13, 2014 9:32:30 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 13, 2014 8:35:11 AM

never............
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 12, 2014 10:46:20 PM

After 60 years of driving, I can only say that I know what works for me in a personal way related to my driving career. Safety in the first thing in mind, keeping tension to a decent level is important as a driver, also being alert for the unknown which depends on ones 5 most important blessed senses/reflexes/coordination.

Saving fuel is important but not as a risk to any of the above mentioned decisions by any driver.

I find that anytime a driver releases the go pedal the vehicle will attempt to slow nearly to a stop, nearly by say 6-12 MPH. when in gear mode(Drive)with engine running/idling. Most final gearing drivetrains are near 3:1 ratio or thereabouts.

The final gearing is subject to driveline resistive forces(internal friction) therefore no total free wheeling and the that OEM system had an advantage of 3 to slow or reduce momentum to a near stop with no brake application, anytime the go pedal is released/cruise off.

The topic if read carefully states the conditions for a possible fuel savings with regard to a somewhat coast event in neutral at engine running at idle or near that rpm speed when encountering a down grade. I took that to mean not a mountain, a winding decent steep decent, dangerous road with no guard rails/ravines and many caution signs, and gobs of other warnings
present.

Again knowing your daily driven vehicles details/design/operations is a good thing to help any beneficial advantages for saving fuel and not being a hazard to anyone by habit. Happy Motoring!
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dassfg
Champion Author Fort Worth

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Message Posted: Jul 12, 2014 8:13:12 AM

No
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contiki
Champion Author Ontario

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Message Posted: Jul 12, 2014 7:57:23 AM

Never......
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Thumper52
Champion Author New Brunswick

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Message Posted: Jul 12, 2014 5:26:28 AM

No
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BCNU
Champion Author British Columbia

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Message Posted: Jul 12, 2014 5:00:25 AM

If I have got to resort to that, guess I'll have to sell the car.
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 12, 2014 12:39:48 AM

Mine sort of rests in the N mode no heavy torque going in or out, like gliding on my bike, body resting, every things corollary/cooler.

Minimum fuel for an older type vehicle per ground coverage(mileage),shows at the refuel pump, depends monthly on the terrain covered.
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46chief
Champion Author Indiana

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Message Posted: Jul 11, 2014 1:55:54 PM

I would like to but isn't that hard on today's automatic transmissions?
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jslessor
Rookie Author Ontario

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Message Posted: Jul 11, 2014 11:37:42 AM

Apparently this was a thing in the 70s
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Awing1
All-Star Author Ontario

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Message Posted: Jul 11, 2014 8:22:14 AM

No, I don't think there will be noticeable gas saving.
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b899
Champion Author Connecticut

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Message Posted: Jul 11, 2014 8:18:28 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 10, 2014 7:08:37 AM

Never.........
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rmw10rpw
Champion Author West Virginia

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Message Posted: Jul 8, 2014 9:31:53 AM

no
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b899
Champion Author Connecticut

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Message Posted: Jul 8, 2014 9:10:52 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 6, 2014 8:17:12 AM

No....never.....
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puddy
Champion Author Wisconsin

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Message Posted: Jul 6, 2014 7:26:03 AM

no
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Jackson126
Veteran Author Virginia

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Message Posted: Jul 6, 2014 7:22:45 AM

No y
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b899
Champion Author Connecticut

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Message Posted: Jul 5, 2014 10:53:19 AM

no
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 5, 2014 8:25:38 AM

Hints are hard to recognize; Like when a traffic light signals to RED. The very moment one sees that ,that would be a great time to release the Go Pedal and use momentum and save fuel/brake pads.

The real learning experience comes from learning that things use up more energy/fuel power going up-hill than they do going down hill. The common ladder is a great example if used in an almost vertical position(most common position).

The only thing I can think of that uses less energy to climb up and then gain enormous travel time/distance is the Glider Plane/Pilot which has a wind advantage. Saving fuel isn't easy, takes Effort.... Driver Efforts GL..!
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contiki
Champion Author Ontario

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Message Posted: Jul 5, 2014 8:09:01 AM

Never..........
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twt
Champion Author Virginia Beach

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Message Posted: Jul 5, 2014 5:13:50 AM

How stupid would that, be?
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WilhamClouse
Champion Author Calgary

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Message Posted: Jul 4, 2014 8:14:16 PM

no
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FocusSVT
Champion Author Toronto

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Message Posted: Jul 4, 2014 10:43:23 AM

Great topic and learn a lot about the engine of cars.
Had been practicing this on my daily commute where there is a stretch of 4 km or 2.5 miles and my average fuel consumption was only 5.6 liters to 100 km and the water temperature dropped a bit too with engine very quiet at idle
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