Ethanol at 10% ( except CA who uses 6% ) is in 54% of all gas sold in the US. It is estimated that by the end of this year, we will have and additional 5 billion gallons produced compared to 2007. By the end of 2009, we could have 10 billion gallons more on the market than today.

I've seen the brick and motor going up for the 5 billion gallons in additional production slated for 2008. 5 billion on top of that is proposed for 2009, but not under construction, yet.

It looks like there is a significant drop in MPG moving from pure gas to E10.
It looks like there is slight, ( 2% or less ) addtional MPG drop moving from E10 to E30. So whatever hit you see with E10, you probably won't see any worst from E30.

Try it, and report back. Fadi, ( MiaTurbo ) has with good results in his HCH. The HCH loses less MPG percentage wise than the Ford Escape Hybrid.