First 1000 miles I used Gas and 10% Ethanol avg MPG 33.4. Vehicle was sluggish and had a noticeable hesitation. 1001 to 6700 miles 100% Gasoline 41.02 mpg hesitation gone.
After I crunched the numbers the additional cost for 100% Gas is $0.0018 per mile however there is no hesitation and the engine feels smoother with a bit more pep.