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I get about 19 mpg and with a 13.5 gal tank and a 45 Mike round trip commute.... My tank feels awfully small! The OFT tune is good from E60 to E90, there's no performance benefit from anything more than 60% ethanol. There's a lot of info on this forum about it. My car feels so much better on corn juice too. You can use a wide range of ethanol % because E85 is much more tolerant of a wider ranger of AFR, unlike gas that only makes power in a very narrow AFR range.
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