Yep sure does. It just sort of occured to me during the E10 tuning that perhaps I needed to pay attention to the butt dyno rather than just maf values, because maybe the maf values were downplaying its success/or not. I remember seeing that mentioned when I was doing water/meth injection. ie the oxygen rich auxillary fuel is going into the airstream post maf so you wouldn't see all the engine power gained represented in the airflow through the inlet. It'd seems though that at 10% ethanol you'd never spot it and that even at E85 levels it'd be tough to claim that a lesser maf plot is actually making the same hp as a better looking plot because of some offset that the ethanol fueled car can claim in the maf numbers.
Well in my case I definitely don't think that the E10 plot was close enough to the 98 ron for that to even become an issue. 98 was definitely the less affordable winner.