wtf, did no one read the chart/link i posted on page one.
Gas has more energy then a gas + ethanol mix. No experiments needed. The only thing to decide is if the price is worth the millage saved (for those that don’t need octane rating as a deciding factor)
The octane rating is a measure of the resistance of gasoline and other fuels to detonation. If u need a higher octane to prevent detonation then this should be ur determining factor for a higher grade.
“Octane rating does not relate to the energy content of the fuel. It is only a measure of the fuel’s tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner.”