Quote:
Originally Posted by rotorwrench
Government mandates follow contents of motor fuel pretty closely. E85 should be very close to 85% fuel grade ethanol with the rest being normal unleaded gasoline. The ASTM allowance was for winter starting since manifold preheat would be required with a full 85% fuel grade ethanol. Winter grade has to be closer to 51% or the tax payers would have a cow. In the warmer climates it is pretty close to 85% so the ASTM used 83% as part of the equation.
Octane is more of a gasoline thing since gasoline based motor fuels have to have an anti knock index. The lower the compression, the lower the antiknock index can be. Ethanol cools the fuel charge naturally so an anti-knock index would confuse the hell out of people. Folks have equated the anti knock index with more power for years so they would think that E85 was rocket fuel but it takes more of it to make the same power as gasoline.
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It's the alcohol levels that the turbo charged LS Chevy guys like about E85.