Ethanol-free premium

[JayRolla]

Ethanol has about 60% of the energy value of gasoline. So, a 10% blend of ethanol/gasoline will have roughly 96% of the energy of pure gasoline. That should translate to a 4% drop in mileage, all else being equal. At a nominal 20 mpg, that would be a .8 mpg loss. So, I can see a mileage hit from using ethanol blend, but probably not 2mpg, unless they have a 50 mpg car.

On e10 I could get 300 miles to the tank. On e85 I would get 150-200 miles. Its a pretty big hit thats for sure. Even have tried to do lean tunes running 16.5:1 AFR in closed loop. Still didnt help.

BUT YOU GET ALL THE HORSE POWERS!