I have a 645 hp 500" 440 that will be street driven, it has iron heads so it has a stout cam and I know it will probably get less than 3 mpg on e-85. This combination has been together for twenty five years but if I was to start from scratch it would be a gen 3 turbo. It would be nice to have more drivability....10 , 15 miles per gallon in addition to more power.