[Kracka]

E98 = a known, consistent product of 97.5-98.0% ethanol and 2.0-2.5% natural gasoline denaturant, no mystery sludge blend rates to make anywhere from E50 to E85...but generally in the E70-E80 range. E98 octane rating is going to be more like ~115, while E85 will be 105ish (but completely variable depending on the blend, and what was used for the blend).

If you can find an actual supplier or blender to barrel the straight E98 for you, it would be MUCH cheaper than what the race gas suppliers are selling it for; I'm talking well under $2/gal with the right connections.