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Author Topic: Fuel mileage difference using different grades of gasoline? Back to Topics
wamster
Champion Author
Houston

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Message Posted: Sep 18, 2009 9:25:39 AM

I don't know if this subject has been posted before; at least I didn't notice it.

Regular, midgrade, premium runs about 10 cents difference per gallon. Has anyone noticed or figured out whether the difference grades make your fuel mileage better?
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musicreporter
All-Star Author San Antonio

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Message Posted: Jan 7, 2013 9:55:49 AM

not sure need more research
RalphHightower
Champion Author South Carolina

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Message Posted: Mar 13, 2012 6:20:33 AM

I use the manufacturers recommendation: premium.
bonbNJ
All-Star Author New Jersey

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Message Posted: Mar 13, 2012 4:18:00 AM

i dont think so
geezer
Champion Author Albany

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Message Posted: Mar 12, 2012 10:57:57 PM

diesdown, good point. Now get yourself to a dictionary and look up "grammer."
diesdown
Champion Author North Carolina

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Message Posted: Mar 10, 2012 6:12:26 PM

Has anyone noticed or figured out whether the difference(wrong) different (right) grades make your fuel mileage better? Proper grammer always helps the information sharing flow easier, and make sense!
shawd8
Champion Author Eugene

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Message Posted: Mar 10, 2012 10:19:55 AM

It depends on what the manufacturer recommends. Follow that. But...I have noticed slightly better MPG's using higher grades, but it basically offset by the increased cost. So it's a wash.
Sherm493
Rookie Author Nevada

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Message Posted: Mar 10, 2012 1:10:59 AM

It has nothing to do with mpg but the car runs better and lasts longer.
KansasGunman
Champion Author Kansas

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Message Posted: Mar 10, 2012 12:39:46 AM

Grade of gasoline has little or nothing to do with mpg.
jonjon57
Champion Author Raleigh

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Message Posted: Mar 10, 2012 12:37:37 AM

No difference
emtrob2012
All-Star Author Myrtle Beach

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Message Posted: Mar 8, 2012 12:54:18 AM

yes, the higher the grade, the better the mileage..

just not very cost effective
forresj
Champion Author Wilmington

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Message Posted: Mar 7, 2012 7:33:33 PM

There are no mileage benefits from using different gasoline grades.
Edpap
Champion Author Pennsylvania

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Message Posted: Mar 7, 2012 6:17:11 PM

No noticeable difference. Some premium fuels do burn cleaner
francescaromana
Sophomore Author Modesto

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Message Posted: Mar 1, 2012 6:39:37 PM

I tried it once, but didn't notice a difference.
emtrob2012
All-Star Author Myrtle Beach

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Message Posted: Mar 1, 2012 4:48:49 PM

yes, I do see an increase of like 1-2 mpg with high grade, but it is more expensive and not cost effective
watch4you
Champion Author Jacksonville

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Message Posted: Mar 1, 2012 1:35:41 PM

Mechanics tell me that using higher grade (octane)does not improve mileage but is simply burned up by the engine. I have tried it a few times and not seen a change.
Houckster
Champion Author Atlanta

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Message Posted: Mar 1, 2012 1:30:13 PM

MAGICBUS19714 writes: I know after summer, I get better mileage and more performance. Must be the E-10.
____
Ethanol is in our gas year round. Everyone gets better mileage in the summer because there's a higher BTU content.

As for getting better mileage with premium as opposed to regular, some cars are coming with ECUs that can provide better performance with premium than with regular because they have the fuel tables necessary to optimize engine performance relative to the octane of the fuel. Unfortunately, the price differential between regular and premium is in the 30-40 cent range in most areas and so the cost per mile with premium will probably be higher than with regular.

It would be interesting to find out whether Big Oil is gouging us with the premium price differential or that the price is justified.

[Edited by: Houckster at 3/1/2012 1:31:07 PM EST]
Skyjunky
All-Star Author Portland

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Message Posted: Feb 26, 2012 9:11:14 PM

IF you just buy ethanol reg gas it is like running on water.. there are places that do sell UNLEADED reg which gains me back up to my manufacture MPG which is good .
I would not spend the price for the prem fuel with ethanol in it it is still junk ...
hubie24
Veteran Author Michigan

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Message Posted: Feb 26, 2012 5:46:52 PM

There is no difference in gas mileage when filling up with a higher octane. Just fill up with what the manufacturer specified in the owners manual or your car will not operate correctly.
taxtaxtax
Rookie Author Alberta

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Message Posted: Feb 26, 2012 2:29:52 PM

I have tried both regular and premium and couldn't notice a difference at all, besides in my wallet.
kellyoneal
Champion Author Louisville

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Message Posted: Feb 26, 2012 11:06:16 AM

I get the same mileage
jonjon57
Champion Author Raleigh

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Message Posted: Feb 26, 2012 7:59:29 AM

Same mileage
MertieMan
Champion Author Lexington

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Message Posted: Feb 22, 2012 9:50:43 AM

You won't get more milage by using a higher octane gas. You only burn in the vehicle the octane that the manufacturer recommends. Using higher octanes will do damage to your intakes, waste money and accomplish nothing in the process.
Magicbus19714
Rookie Author Ohio

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Message Posted: Feb 22, 2012 1:09:10 AM

I don't see a difference and I run a 97 Ford with a v-8. I use regular. I bought the car 4 years ago with 42K on it(now have 80K) and it was knocking when I first got it. I ran premium for about a month and then switched back to regular. Never knocked again. The gas mileage was the same. All the premium did was correct the problem which was probably bad gas. I know after summer, I get better mileage and more performance. Must be the E-10.
PaylessKY
Champion Author Kentucky

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Message Posted: Feb 22, 2012 12:24:50 AM

Its best to check the manual for your vehicle and use the octane stated.
The manual for my car states 87 octane or higher. I use 87 octane 99% of the time.
timmyC4
Veteran Author Twin Cities

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Message Posted: Feb 21, 2012 11:58:18 PM

Whenever possible burn non-oxygenated fuel. In other words, stay away from ethanol. It will degrade your economy. If midgrade is 10cents more a gallon and no ethanol, you're better off. Ethanol is junk.
Houckster
Champion Author Atlanta

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Message Posted: Dec 20, 2011 12:45:18 PM

In the last 2-3 years, this question has become more complicated. Most cars on the road will not benefit from premium if they are designed to use 87 octane fuel. This is because to use the premium fuel optimally, the engine must have the sensors and fuel tables necessary to adjust the spark timing and only within the last couple of years has this begun to change.

Many newer cars are designed to run fine on regular but will deliver a bit better performance and mileage on premium because they do have the ability to adjust for higher octane fuels. This was true on a 2010 Ford Taurus I drove briefly. I suspect this change will become the standard but the problem is that on a cost per mile basis, most people will opt to use 87 octane because 91-93 octane fuel will be more expensive. Around here, premium fuel costs 30-40 cents more.
nwsynthetics
Champion Author Oregon

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Message Posted: Dec 19, 2011 10:53:04 PM

I dont think Im seeing a real differance. Get rid of ethanol, and u will see better mileage.
skynet
Champion Author Macon

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Message Posted: Dec 19, 2011 6:03:45 PM

No difference that I can tell.
1007
Champion Author Michigan

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Message Posted: Dec 16, 2011 11:37:05 AM

I drive an Envoy 2002 6cyl. 89Vs 87 no difference on thr highway
gvan
Champion Author Chicago

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Message Posted: Dec 16, 2011 11:12:52 AM

The only thing you are improving by using a higher octane than required is the profits of the gas station owner.
pacecar68
Champion Author Oakland

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Message Posted: Dec 15, 2011 10:46:33 AM

no difference...purchase the required level of octane as specified in your owner's manual.
Bus936
Champion Author Lexington

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Message Posted: Dec 15, 2011 9:34:14 AM

Absolutely not. You need to only run what the manufacturer recommends in your vehicle. Using higher octane than necessary could cause damage to your intakes, plus you are wasting your money in the process.
gobux10
Champion Author Ohio

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Message Posted: Dec 15, 2011 7:44:15 AM

go with regular
HybridTraveller
Rookie Author Detroit

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Message Posted: May 5, 2010 7:25:41 PM

I record the numbers for every tank in a book that stays in the car. I've tried different grades and formulations. Basically, I have been unable to detect any difference in mileage. If there is, it is swamped by the tank-to-tank variation generating noise in the data.

All of my cars spec 87 octane gas. I will use the "Regular" grade at whatever octane rating it has when in the mountains.
boatcrazyinme
Champion Author Maine

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Message Posted: May 5, 2010 12:12:59 PM

I get my best milage from Irving gas.
Boyrr
Champion Author Allentown

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Message Posted: May 4, 2010 6:01:07 AM

if your machine only heeds regular, you will not gain anything by buy the more expensive grade.
pinbuster2005
Champion Author New Hampshire

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Message Posted: May 4, 2010 5:10:30 AM

theUBERxA - You say an extra 2 mpg on average isn't worth paying 20 cents more a gallon for premium. Well lets look at in cost per mile. I don't know what you get for mileage but i'll just use an example.

If you get an average of 20 mpg with regular and it costs $2.80 a gallon that would be 14 cents a mile that it costs you to run it.

if you get an average of 22 mpg with preium/super and it costs $3.00 a gallon that would be 13.637 cents a mile to run it.

So yes in the long run it's cheaper to run the premium in your automobile.

If you get 30 mpg on regular at $2.80/gal it would cost you 9.333 cents a mile.

if you get 32 mpg on premium at $3.00/gal it would cost you 9.375 cents a mile.

So in that case it isn't cheaper to run premium.

Basicly it comes right down to what your automobile gets for mileage and if you figure it out to the cost per mile you'll find out what one is truely the cheapest to run overall.

I tried premium in my 2001 f-150 pick-up because the station I went to was out of regular and was selling premium for the regular price. My mileage dropped 3 mpg with it. If it had gone up I would have tried it a couple more times to see if it was a fluke or not.
AmericanMAN
Champion Author Michigan

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Message Posted: May 2, 2010 12:10:15 AM

1
Vibe03
Veteran Author Toronto

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Message Posted: May 1, 2010 11:42:26 AM

Had been putting a tank of good stuff (premium grade) every 4 - 5 tanks and I think it is like a mini-tuneup and makes the engine cleaner, hence betting mileage
SiRMatt
Rookie Author Vancouver

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Message Posted: Apr 28, 2010 1:12:43 AM

If you run a car with a high compression engine like mine. Use the fuel type required by it, which is 91 octane or better. If you try to run lower octane fuel you will get detonation and screw up your engine, unless you wanna retard the timing. But lets not go there :)
the1roadhog
Champion Author Atlanta

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Message Posted: Apr 25, 2010 8:03:27 AM

Not so I've noticed.
BUSSY
Champion Author Dallas

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Message Posted: Apr 25, 2010 7:33:25 AM

Use the octane recommended by your owners manual and you will receive optimal performance and mpg. If not let a good certified mechanic at your dealership check it out.
Quick68
Champion Author Columbus

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Message Posted: Apr 25, 2010 1:43:12 AM

All gas gives me the same mileage.
PaylessKY
Champion Author Kentucky

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Message Posted: Apr 24, 2010 11:37:00 PM

Just use what your vehicle calls for. If it is 87 octane that is all you need.
bobber62
Rookie Author Twin Cities

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Message Posted: Apr 21, 2010 8:10:19 PM

I LIVE IN SOUTH EASTERN PART OF MINNESOTA LAKE CITY MN. I HAVE NOTICED THAT OUR GAS PRICES ARE AT LEAST 10 TO 15 CENTS CHEAPER THEN THE TWIN CITIES.
PaylessKY
Champion Author Kentucky

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Message Posted: Apr 12, 2010 1:17:02 AM

Use the grade your vehicle calls for.
cyrix
Champion Author Los Angeles

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Message Posted: Apr 11, 2010 3:44:02 AM

I've always used 87, and my mileage has never varied.
theUBERxA
Rookie Author San Diego

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Message Posted: Apr 10, 2010 6:40:04 PM

i notice about a 2mpg avg gain with premium over the span of three tanks, full to empty . its definitely not worth the 20cents more for me. comes out to 6bux more to go just an extra 33miles.
FieroGT
Champion Author Twin Cities

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Message Posted: Apr 10, 2010 6:02:07 AM

I don't think so. If a car engine was built to run on 87 octane, it won't run any better on 89 or 92 octane fuel.
NanookAK
Champion Author Anchorage

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Message Posted: Apr 9, 2010 12:24:22 PM

I doubt if it will make a significant difference except perhaps in your wallet.
ricebike
Champion Author New Jersey

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Message Posted: Apr 8, 2010 10:20:38 PM

wife's 2005 acura mdx requires 91 octane

but wife uses regular

net loss of 3 mpg between the two grades
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