Has anyone dared to put a tank (or half a tankful) of E85 into their vehicle to see how well it ran?

(E85 = fuel that is 85% ethanol, 15% gasoline)

I know officially the vehicle only supports E10 (10% Ethanol, 90% gasoline) but I have heard success stories from other folks running E85 (not Isuzu) once the Engine Computer adjusts to it.

(I'm talking about vehicles NOT approved by the manufacturer for E85).

So, has anybody tried it in their Isuzu? Know of any issues?

Nate