E85 is 85% ethanol, generally runs about 106 octane. Most folks don't have any use for ethanol but we've been running it for 5 or 6 years now in drag cars and circle track cars. Not as efficient as gasoline so you have to pump more of it to the engine. Takes some reworking on the carb, too. But when things are set up right, it really works good FOR ME!!!! Don't have any idea what the availability is around your area, here in the cornbelt it's available most everywhere....

Also might want to check into a water/methanol injection system... There's a number of companies making them, my experience is with one made by Snow....used it on a blown car with a boost reference system, worked great!!!!

Cetane is the rating system for diesel fuel.

What are your running for an ignition system and timing??? Sometimes you can pull a few degrees of advance out of the engine in the rpm range where it rattles and cure the problem, too...