E85 is not only cheaper than pump gas, but if you run meth you have to pay for pump plus meth. E85 is by far MUCH cheaper and it's amazing for tuning aggressively to give you optimal performance out of your setup. Even if the blend changes it's never big enough to have to worry about. If you tune your car on E85 with lets say a 12.5 a/f at wot. With E70 it will just make you run richer. Lets just say around 12.1 or so a/f. (More safe) For closed loop cruising the ecu can just take car of that just like any factory car would do since the ethonal content in pump is not always the same. I don't think the inconsistancy of E85 is enough to think about switching back to pump. Also the loss in gas mileage IMO isnt enough to switch either. You got E85 for 1.90 (give or take) a gal. Then you got premium pump gas for 2.60 (give or take) a gal. And on top of that METH.
That's just my opinion.
