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Better MPG with pure gas. #5400095 04/11/20 10:05 AM
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MRtv Offline OP
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So in the past I have tried non-ethanol fuels in my 97 Ford F150 4x4 with a 4.6 engine. I found i got NO different gas milage using it vs. 10% ethanol fuel. I was pretty disappointed my vehicle just didn't see a difference in fuel types. I had bought the vehicle for pretty cheap from a young guy who had not taken a lot of good care of it despite what he represented to me. I dropped a rebuilt engine into it and over the years it pretty much got 12-14 mpg. Occasionally it would see higher but not consistently.

I began to have transmission trouble. I took it into a transmission shop and the tranny was rebuilt. The shop owner said I may see better gas milage but didn't make any big promises about it. At the time winter blend gas was being pumped so no I didn't really see any bump in my gas milage. Then came the summer blend. I did see the usual bump up in milage for the summer blend. Then I began to see the milage crawl upwards with combined city and highway drives. I generally use Top Tier gas with occasional fills without Top Tier gas. I saw a trend in much better milage. I was seeing 14.5 pretty regularly with city driving and 15.5 with occasional 16 mpg fills with highway driving. I was pretty happy about it and thought it was due to the summer blend.

On a lark I dropped into a non-ethanol station to fill up. Phillips 66 here in Boise offers all grades of the gas with no ethanol. I filled up with some 87 octane and headed out on the freeway for a service call some distance away. I noticed my gas gauge was moving much slower than usual. I returned to town and filled up at the same Phillips 66 with non-ethanol gas. I got 18.6 mpg. I was pretty happy about that. It looks like with my rebuilt transmission rebuild I finally have the potential for real gas to show me that my truck can reach a higher milage now.


2014 Nissan Versa Note 1.6 liter engine. 1997 Ford F150 4x4 4.6 liter engine.
Re: Better MPG with pure gas. [Re: MRtv] #5400101 04/11/20 10:10 AM
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CT8 Offline
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My F150 gets about a mile per gallon better with 100% gas. I never figured out the cost to mpg benefits though. The Mpgs are better with summer gas.


2015 F150 2.7
2018 F350 6.2
Re: Better MPG with pure gas. [Re: MRtv] #5400106 04/11/20 10:18 AM
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WobblyElvis Offline
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The energy content of %10 ethanol gas is roughly %96.5 that of straight gas. This difference should be seen in fuel consumption but it's rather small.

Re: Better MPG with pure gas. [Re: MRtv] #5400112 04/11/20 10:26 AM
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JohnnyJohnson Offline
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My Corolla get about 2 MPG more on real gas. Which they carry at our local Cenex.


2004 Corolla 140104
Out: Havoline Pro DS 10w-30 Purolator PureOne 10-29-19 136457
In: Pennzoil Platinum HM 5W-20 ST 4386
2006 Duramax 77077
Out: T6 5W-40 XG9100 73909
In: Rotella Dino PH9100 11-3-19
Re: Better MPG with pure gas. [Re: MRtv] #5400114 04/11/20 10:31 AM
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Other things to try is, pumping up your tire to the max pressure on the sidewalls, checking your brakes to make sure there not dragging and are releasing quickly. Take out any unnecessary weight out of the truck. Check the alignment, and make sure your air filter is new. If all of that is good, that's about as good as it will ever be.,,

Re: Better MPG with pure gas. [Re: MRtv] #5400120 04/11/20 10:37 AM
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JohnG Offline
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There should be no difference in summer/winter grade gasoline. For summer blend, butane is removed from the mix and stored in caves or tanks to lower the rvp, in the winter it is put back in.

Anyone seeing lower fuel economy in winter is probably due to other factors. These can be more idle time, thicker fluids, and possibly less complete evaporation while the engine is still cold.

Re: Better MPG with pure gas. [Re: BigCahuna] #5400149 04/11/20 11:30 AM
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CourierDriver Offline
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Originally Posted by BigCahuna
Other things to try is, pumping up your tire to the max pressure on the sidewalls, checking your brakes to make sure there not dragging and are releasing quickly. Take out any unnecessary weight out of the truck. Check the alignment, and make sure your air filter is new. If all of that is good, that's about as good as it will ever be.,,

approved best quote of the day


I'd still like to have my 67 Beetle back....life was easy then..imho 2 quarts of oil roughly ,lol
No matter what time it is,its always time for a nap
Re: Better MPG with pure gas. [Re: MRtv] #5400156 04/11/20 11:40 AM
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ripcord Offline
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I found that maxing the air in the tires just meant I spend the money I saved on fuel on premature tire replacement. Now I just run a couple of PSI extra and call it good.

Re: Better MPG with pure gas. [Re: MRtv] #5400171 04/11/20 11:51 AM
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FT92 Offline
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my honda accord gets better mileage in the warmer weather ..summer gas maybe ?? I would say at least 2-3 miles a gallon which isn't a tremendous amount but I'll take it

Re: Better MPG with pure gas. [Re: MRtv] #5400239 04/11/20 01:14 PM
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Eddie Offline
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I actually ran the numbers on 100% gas vs 90/10% ethanol. The BTU differences yielded a 4.7% difference.Therefore you should get about 4.7% lower MPG using 10% ethanol. Ed


2014 CX5 Touring 2.5L :-)
Re: Better MPG with pure gas. [Re: MRtv] #5400249 04/11/20 01:26 PM
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Aichiguy Offline
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I got similar results to Eddie. However, with a 34¢ spread between regular and E10, it makes sen$e to use E10 in Iowa if your engine is tolerant.


2019 Honda CR-V LX 2.4
2009 Honda Ridgeline 95k
Re: Better MPG with pure gas. [Re: ripcord] #5400286 04/11/20 02:05 PM
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Originally Posted by ripcord
I found that maxing the air in the tires just meant I spend the money I saved on fuel on premature tire replacement. Now I just run a couple of PSI extra and call it good.

This, and over-inflated tires (per the vehicle weight) are less safe due to reduced traction.

Re: Better MPG with pure gas. [Re: ripcord] #5400288 04/11/20 02:09 PM
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sloinker Offline
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Originally Posted by ripcord
I found that maxing the air in the tires just meant I spend the money I saved on fuel on premature tire replacement. Now I just run a couple of PSI extra and call it good.


Is this true? On radial tires I've always been under the notion that the lower the pressure the higher the wear rate. The recommended pressures affixed to the car's door post is for the best dynamics of your cars suspension or ride quality/handling. I don't pressurize to the max but I well over-pressurize and in my non-scientific checkbook database of 40 years of tire purchasing I say the higher the pressure the better within reason.


'16 Tiguan TSI Vaico 5W40
'15 VW Golf TDI Red Line 5W30 Euro
'15 VW Golf Sportwagen TDI M1 ESP 5W30
'14 Dodge Grand Caravan 3.6 Valvoline 5W20 Semi Synthetic
'64 Plymouth Fury440 Pending
Re: Better MPG with pure gas. [Re: sloinker] #5400341 04/11/20 03:24 PM
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whatnext Offline
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OK, basic info here:

Low tire pressure will result in the inside and outside edges wearing. High pressure will result in the center wearing. There is an ideal tire pressure for each application where the wear will be even across the tire. This ideal pressure will also result in a balance of the best handling and ride comfort. 1 - 2 psi below or above this ideal tire pressure will have a small effect on handling and comfort (but can be noticed by a discerning driver/owner). Higher psi for handling, lower for comfort.

For simplicity, assume the pressure on the car's decal is the ideal pressure. The max pressure allowed on the tire is like 10 psi higher. If you max the pressure, that will wear the center of the tires.

On topic: Here in the NE, we see a significant change (10-15%) in gas mileage every fall and spring. Lower mileage starting in the fall (and the winter weather isn't here yet) and higher mileage in the spring. So it is assumed the winter blend doing it.

Last edited by whatnext; 04/11/20 03:33 PM.
Re: Better MPG with pure gas. [Re: MRtv] #5400388 04/11/20 04:24 PM
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2012 Equinox 2.4, 2+ more MPG everytime. Wife's 2019 Charger 3.6 2+ more MPG.


"None of us are getting out here alive...drink that beer...eat that pizza...drive that Hot Rod"
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