That might be true for my platform, but I don't think anyone has really bothered to test it; MPG is more of an afterthought where I normally live (forums wise). I'm investigating it because while E85 is plentiful where I live, I do want to go to other places that may or may not have it and getting good MPG on the sauce would be beneficial for those sorts of trips.
No, the modifications are not for the same reason.
My car actually has two fuel pumps; one is a sender that's in the tank, the other is a high pressure pump driven by the camshaft. I was able to figure out (through testing theory) that the issues my platform has has to do with oil getting into the high pressure fuel pump, and combined with lots of heat (as it's bolted directly to the head) and some kind of chemical reaction with the ethanol, sticky films are formed that gum things up and prevent the pump from building the requisite 1800 PSI needed by the injectors to flow properly.
I did this by boiling E85 in a pot on a hot plate (even tested some ceramic coatings to see if they would help; they did not):
And before anyone asks, yes, there was a fire:
Unfortunately, there aren't any aftermarket injectors for my platform, so I don't have that option; I'm adding 3000 CC worth of injectors pre-throttle body, however, and that will basically double my overall fuel flow into the engine.