Does Ethanol Free Premium Gas Improve Mileage in Cars? - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 12-28-2016, 10:23 PM Thread Starter
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Does Ethanol Free Premium Gas Improve Mileage in Cars?

The only ethanol free gas that I can find locally for my Ariens is premium and it's 70 cents more per gallon than regular. When we went to by my first gallon of gas for my new SB I filled our GMC Yukon too.

My wife thinks she's getting better mileage but I wonder if it's a 30% better. I didn't write down her mileage so I can't calculate it. At 30% increase in mileage we just break even. There's no way it can improve mileage more than 30%, can it?
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post #2 of 20 Old 12-28-2016, 10:35 PM
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It WILL improve fuel economy & performance on passenger vehicles. I'd run maybe 2 tanks of it to test it and record the results and then decide if it is worth it or not.

Last edited by GoBlowSnow; 12-29-2016 at 06:22 AM.
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post #3 of 20 Old 12-28-2016, 10:45 PM
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I agree it will increase fuel mileage but I doubt it would 30% better. If you average say 15 MPG. A 30% increase would equal about a 4.5MPG increase. If that was the case everyone would be running ethanol-free lol
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post #4 of 20 Old 12-28-2016, 10:51 PM
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So from the race car world.....
E85 = 85% ethanol also its 104 octane...
It takes 30% more volume over the same conditions. This is based off the standard of e15% ... I know it's not related to power directly but it's more about volume of fuel usage compared.

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post #5 of 20 Old 12-28-2016, 11:22 PM
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Based upon energy content of 10% ethanol versus 0%, you should see a 3% increase in MPG by using the 0% ethanol.
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post #6 of 20 Old 12-28-2016, 11:26 PM Thread Starter
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Quote:
Originally Posted by DaBomb6988 View Post
I agree it will increase fuel mileage but I doubt it would 30% better. If you average say 15 MPG. A 30% increase would equal about a 4.5MPG increase. If that was the case everyone would be running ethanol-free lol
She averages 15.6 MPG and she says it's showing just over 19 on the current MPG display so that's pretty close to your numbers. I guess I'll have run a couple of tanks through it and do it the old fashioned way with pencil, paper and calculator.

My gut's telling me it isn't as great of an increase as she thinks it with so little information.
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post #7 of 20 Old 12-28-2016, 11:32 PM Thread Starter
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Originally Posted by RIT333 View Post
Based upon energy content of 10% ethanol versus 0%, you should see a 3% increase in MPG by using the 0% ethanol.
It's also premium vs regular octane too, we don't have ethanol free regular here so I can't really compare apples to apples.

Like you calculated, all I'd expect to see would be a few percentage points.
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post #8 of 20 Old 12-28-2016, 11:38 PM Thread Starter
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Originally Posted by GoBlowSnow View Post
It WILL improve fuel economy & performance. I'd run maybe 2 tanks of it to test it and record the results and then decide if it is worth it or not.
I'll run a couple of test tanks through it now for a ballpark comparison. The problem is with the constantly changing road conditions of winter it'll be tough to get reliable numbers. When the warm dry weather returns I'll do it again for a more accurate comparison.
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post #9 of 20 Old 12-29-2016, 12:13 AM
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It may make a tiny difference but not that much. It was a fluke
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post #10 of 20 Old 12-29-2016, 01:29 AM Thread Starter
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Originally Posted by NJHonda View Post
It may make a tiny difference but not that much. It was a fluke
That's what I'm afraid of. My instant MPG reading was 101 MPG once in my '07 Tundra but I was towing and going down hill. I think the trailer was doing most of the pushing. If cars got that kind of mileage the oil companies would just jack the prices up to $20 a gallon maintain their profit margins.
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