I am in Pa and the price difference for 87 to 93 is about .70 to 1.00. That being said I live on the border of Ohio and normally go there to get gas where right now I am saving about .90 between Pa 87 and Oh 87. I have a 23 5.0 in route to my dealership right now and what I am wondering is if anyone has any thoughts on running E85 and what mpg difference is between the E85 and regular 87.