I believe this thread started out as a mileage quest. More miles on 100% gasoline. That is accurate. Why? Ethanol has less energy per pound mass than gasoline. Think of it as filler in bologna. It doesn't necessarily make it bad, just not as good as 100% real for making power. If you think the Fed is messing with your fuel the Ethanol thing is trivial compared to the MTB fuels fiasco foisted on the public. The government monkeys with gasoline formulation in the 'pursuit' of cleaner fuels only to make engines run less efficient causing MORE pollution. It's great when our elected leaders force changes onto industries that do only ONE good thing, add taxes to our economy. The government mandates that gasoline manufacterers must add an oxidizing agent to fuels so they burn cleaner, then tax the snot out of the additive. The additive has two effects, makes money for Washington and makes engines less efficient so fuel economy is robbed. Means more fuel per mile, so MORE money for Washington.
I'm beginning to sound like a conspiracy theorist...................