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Discussion Starter #1
I've been tracking the mileage on every tank of gas since I bought my Accent new in 2008. At over 215,000 miles, over 600 fills for over $17,000 I've got a very good idea about the mileage the car is capable of.

I average about 34-38 mpg in the summer, 30-34 mpg in the winter. The car is driven basically the same route, 5 days per week weather permitting.

Recently I was able to procure some non-ethanol gas at a local station thanks to pure-gas.com. The first tank yielded a very nice 40.1mpg and the second tank produced an awsome 43.3 MPG! This was without my best attempt and I predict with a concerted effort I may be able to hit 45 MPG with non-ethanol fuel.

Monetarily it will be about a wash considering the premium price. It costs about 15% more than the government-subsidized E10.

Kevin
 

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I also have been using 100% 87 octane gas for past year or so. It is a break even financially as the increase in MPG (2-3 mpg) is offset by the higher cost. If the price differential gets to be more it will become a loser, currently about 40 cents a gal more for the 100%. Better mileage but I feel it is also better for the fuel system and engine
 

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I've been tracking the mileage on every tank of gas since I bought my Accent new in 2008. At over 215,000 miles, over 600 fills for over $17,000 I've got a very good idea about the mileage the car is capable of.

I average about 34-38 mpg in the summer, 30-34 mpg in the winter. The car is driven basically the same route, 5 days per week weather permitting.

Recently I was able to procure some non-ethanol gas at a local station thanks to pure-gas.com. The first tank yielded a very nice 40.1mpg and the second tank produced an awsome 43.3 MPG! This was without my best attempt and I predict with a concerted effort I may be able to hit 45 MPG with non-ethanol fuel.

Monetarily it will be about a wash considering the premium price. It costs about 15% more than the government-subsidized E10.

Kevin

I did a write up on this a couple years ago. Yes, the car does get better mileage with the non-ethanol fuel, but the few places around here that have it ONLY have it in Premium. I'm not going to open the whole can of worms all over again, but I have found my car does better on Premium anyway. However the N/E Premium is usually 50 cents/gallon more so I don't use it much.

Unfortunately, I also have to go ~100 miles to get it (I'm in Mass...they will NEVER allow N/E gas here) so I haven't had any for about a year now.
 

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I have tracked every gas fill up for mpg readings on all my cars for 20+ years on GasBuddy.com or Fuelly. I know what my 4 family cars get mpg wise very well. I have filled up with ethanol free gas probably 10 times in various vehicles just to test for myself if the claimed better mileage is noticeable. I can say that for my experience, there was not a noticeable enough bump in mpg's to justify the 40-60 cent cost difference over normal 87 octane regular fuel (ethanol 10-15%).

That being said, I do believe that running ethanol free fuel is better for your car due to the corrosive nature of the ethanol. I actually do buy the ethanol free gas in 2.5 gallon quantities for use in my lawn equipment as these items are especially prone to ethanol related fuel issues.
 

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Only issue with E10 ethanol gas is in my small engine pressure washer. It has a bad carb/tank design and the water will build up over time and collect on the bottom of the tank. Been using E10 gas since 1980 almost exclusively. Both my cars get better than EPA averages. Besides I have to go 50 miles and pay the same as 89 octane gas.
 

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I have tracked every gas fill up for mpg readings on all my cars for 20+ years on GasBuddy.com or Fuelly. I know what my 4 family cars get mpg wise very well. I have filled up with ethanol free gas probably 10 times in various vehicles just to test for myself if the claimed better mileage is noticeable. I can say that for my experience, there was not a noticeable enough bump in mpg's to justify the 40-60 cent cost difference over normal 87 octane regular fuel (ethanol 10-15%).

That being said, I do believe that running ethanol free fuel is better for your car due to the corrosive nature of the ethanol. I actually do buy the ethanol free gas in 2.5 gallon quantities for use in my lawn equipment as these items are especially prone to ethanol related fuel issues.
Only issue with E10 ethanol gas is in my small engine pressure washer. It has a bad carb/tank design and the water will build up over time and collect on the bottom of the tank. Been using E10 gas since 1980 almost exclusively. Both my cars get better than EPA averages. Besides I have to go 50 miles and pay the same as 89 octane gas.
Yeah, the 40-60 cent difference is the deal killer, except for as RR says, being better for the engine. It is now too far for me to go to get it to bother with. When I was a Field Rep I used to go there 5-10 times a month; now I rarely leave my chair....

And, I have always beat the EPA Average for any given car I've had.

Except my Accent. Go figure...
 

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Discussion Starter #10
DATE Pure GasMilesGallonsMPG
10/15/19 390.60 9.95839.22
10/8/19 392.00 10.321 37.98
10/1/19 392.60 9.345 42.01
9/24/19 357.00 9.700 36.80
9/17/19 388.00 8.700 44.60
9/9/19 410.00 9.470 43.30
9/2/19 420.00 9.700 43.30
8/26/19 400.00 9.980 40.08
TEN YEARS PRIOR 10% EthanolMilesGallonsMPG
8/28/09248.007.16634.61
9/1/09302.508.51135.54
9/5/09341.209.54135.76
9/10/09354.009.90635.74
9/15/09349.709.81235.64
9/21/09333.709.45335.30
9/25/09331.008.92837.07
9/29/09344.509.86134.94
 

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Discussion Starter #11
The above results show a 5.3 mpg increase for pure gas over 10% ethanol. I think the fill on 9/24/19 was slightly short and explains the 44.60 mpg result on the previous tank.
 

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Those numbers are really inconsistent with results I have obtained trying ethanol free gas in several makes/models of cars I have owned over the years. Are you sure there are no other variables that could be responsible? 10 year gap in comparisons are a concern to me.

Summer vs Winter blend of gasoline in some markets make a big difference in mpg's, running A/C vs not running A/C, new tires and/or tire pressure changes? Traffic / weather conditions?

As a good test, run a couple tanks of ethanol gas now and see if your mpg's drop back down that 5% differential.
 

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Discussion Starter #15
Congratulations ! You are the only one on the planet whose car gets 25% better MPG's using ethanol free gasoline.
I'm trying to figure out why my mileage improved so dramatically also. I've looked back through the log for this car and the only time it comes close is during July and August when I was "hypermiling". Even then, the highest average over a few tanks was less than 37 mpg. I'm killing that mileage in October now. The pure gas is 91 octane compared to 87 E10. Now, on top of that, this car is only rated for 32 mpg highway and my trip is about 10% stop and go. Mileage on pure gas is close to 40 right now. I'm still traveling the same route daily as I have the last 11 years with this car. The tires are a different brand but aired the same 35 psi.

I'm guessing since almost no one buys the premium pure gas at the station I go to, It's actually still summer blend in the tank. I expect my mileage to drop soon. That said, my average on E10 during the winter drops to 32 mpg or less and I've seen tanks at 28 in January.

Whatever is happening I'm going to continue to run nonethanol gas whenever I can in this car. I love being able to make it a full week without filling up. With E10 I can't do that.

Kevin
 
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