I just left the Ozarks with 87 octane fuel and 10% ethanol gas. Out west I found 85 octane fuel. Not sure of it I used 88 octane fuel.
Don’t know how much ethanol was in it, but in the past I have found I get better gas mileage with REAL GAS.
A few years ago the State of South Dakota ended the use of E85 (85% ethanol 15% gasoline) in their flex fuel vehicles because the greatly lower miles per gallon with E85 made the vehicles far more expensive to run. This was despite the heavily subsidized E85 being priced about 24 cents per gallon less than regular gasoline. Corn based ethanol is a huge boondoggle and does nothing but further subsidize Midwestern corn farmers and make ethanol producers rich at tax payer expense.