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Old 09-02-2014, 02:01 AM   #11 (permalink)
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The other side of the question (at least for some of us) is how many miles per gallon of petroleum we're getting.

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Old 09-02-2014, 02:36 AM   #12 (permalink)
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Quote:
Originally Posted by roosterk0031 View Post
Usually the extra mgp isn't worth the extra money. When I got the cobalt 2 years ago I used E0 to try for big numbers, 2 years ago same time of year 44.99 3-tank, last 3 tank on E10 was 43.7. I think the is pretty close to normal. I think there is a 3% energy content difference so it would be normal to expect that difference.
I think for E10, there is a 15% BTU hit for the ethanol, but at 10% of the total, it would be just a 1.5% BTU hit/gal. My estimate for my car would be not more than a .5 MPG loss. I could be wrong on my info though. Non Ethanol is readily available here without much of a price difference, so I prefer it.
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Old 09-02-2014, 02:55 PM   #13 (permalink)
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With the Cobalt I had back to back tanks of 40.01 in July with E30, so 57 mpg petro. 37-38 mpg with E50, 74 mpg petro.

From the data I found in the past. E10 has 96.4% of E0's btu's . E30 89.3, E50 82.5 & E85 71.6. Assuming 45 mpg of E0 is still a good, E30 per energy calculates to 40.1 mpg, E50 37.1 mpg.
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Old 10-11-2016, 01:50 PM   #14 (permalink)
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i have an ethanol free gas station near work, i have been filling up every other tank (pure convenience)....

do you guys think i should keep doing it?? like religiously?

i use TCW3 in typ 10% ethanol gas, as well (http://ecomodder.com/forum/showthrea...ive-24208.html)
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Old 10-11-2016, 02:47 PM   #15 (permalink)
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I think E0 will net slightly better MPG, about 2-3%, but here it cost almost 15% more. So in cost per mile it's not worth it.

I've been running E15 since it became available near by at 5% cheaper than E10, and getting about 2% loss in mpg vs E10. Maybe 5-7% mpg loss vs E0 but 20% cheaper.

But there has been a study that showed higher Ethanol content can get higher MPG than E0.

http://www.speedperf6rmanc3.com/cont...evel_Study.pdf

See pages 15-17

Last edited by roosterk0031; 10-12-2016 at 11:57 AM..
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Old 10-12-2016, 12:04 PM   #16 (permalink)
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i def noticed that price, and i need to consider that as well.... hmmm....

seems like a wash arghh

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