I was in a hurry today, and one of the E85 pumps at Meijer had a busted gas dispenser, so I just filled up with 100% 87 octane gas.
The last tank was about 32% ethanol, with no CEL's. I swear, any car in America can run E30, if it were commonly available.
I got about 280 miles on the last tank before the low fuel light came on. I'll try and see when that happens with this tank, to get a feel for what the hit to mileage is from higher blends of ethanol.