Originally Posted by ans2k
i'm pretty sure he was referring to the comparison of pure gas and gas + ethanol with the same octane rating.
ethanol in itself produces les power per unit volume than gas at the same octane. E85 has a very high octane rating that can allow you run very advance timing or a lot more boost. you could do the same with pure race gas at 110 octane but the the cost of race gas was something like $7.50 a gallon 5 years ago. i have no idea what it is now.