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Antidotal but I ran between 33 and 75% e85 in my Buick lesabre for about 2yrs, oddly FE was not significantly decernable from E10 fuel, now if I were to compare to standard gas its also a bit bleak since I have only run 3 partial tanks of real gas over the last 2 years as there doesn't seem to be any of that stuff up here in corn country. I could say about 2mpgs better on real gas but it would be hard to tell since the driving conditions vary so much.
I have been having issues with my FE being about 4-6mpg lower in these winter months, I am beginning to think it must be bad winter gas, anyone know if the gas mix for summer/winter is posted by percentages anywhere?
It seems there are over 140 ingredients in todays fuel but the major components are still important to FE.
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