i run e85 and pump on my car well. I switch maps via tephramod (i have an evo 9). So far i love e85, will continue to run it as much as i can.
as far as gas mileage goes. on pump i was getting about 19mpg hwy, and about 16 city. on e85 (this is only my 3rd fill up). im getting about 17 hwy and 14 city.
e85 pump is a hop and a skip away from me.