Honda does not recommend anything more than 10% ethanol blend. All gasoline now is E10, and Honda says E10 is fine as long as it is the same or higher octane as 100% gasoline. I use E10 in my 1991 Accord with zero problems.
Nothing over E15 (15% ethanol) and it should be fine. It could run on E85 (85% ethanol) in an emergency, but it may damage fuel system components.
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The Honda Accord is one of the most fuel efficient vehicles in it's class.
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The 2014 Honda Accord runs on regular unleaded.