Fadi, if the move from E10 to ~E30 was a 2% loss in MPG for you, what is the loss moving from plain gas to E10?

For my FEH, I get a 10% loss in MPG with 10% ethanol. Thus, besides the cleaner emissions, the ethanol does nothing for me, at E10.

The COOL thing is, at 30% ethanol, my MPG is nearly the same as E10.
It's just too close for me to say it was the ethanol, or the breeze that day. So there is an advantage for me boosting the amount. ( costs less, and displaces more gasoline )
So it appears with mostly highway, in mostly below freezing weather conditions.

Thanks for the report.
-John