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adouglas pretty much nailed it, I'll add the things he didn't touch on.
Octane rating... what does Octane in gasoline actually do? Why do we want it in the blend? Octane SLOWS the rate of combustion... yes you read that right, slows the rate of combustion. This is needed in high compression, high performance engines. Nearly all production cars and trucks do not fall into this category. Some high performance motorcycle engines do... but you need to be in about the 12 - 1 or 13 - 1 compression ratio before higher Octane is helpful or needed. Most cars run 9 - 1 and even high performance bikes may run 11 - 1
increased Octane will not give you more horse power out of the same engine... well, not at a noticeable amount anyway. Your engine may run cleaner but that is due to the fact that there are less impurities in your higher grades of gasoline, not the Octane per se'
fuel systems incompatible with ethanol: All manufactures now build their machines to with stand at minimum 10% ethanol in the fuel. Yes, if you have a 1974 BSA Thundbolt with the original natural rubber O-rings in the carbs and case seals... you may have a problem when exposed to ethanol containing fuels. Everyone uses buna-n O-rings today and ethanol exposure is not a problem.
DO NOT run the E85 and E100 fuels in your bike, the fuel to air mix is wrong and can run SERIOUSLY LEAN on those fuels. Oh yeah, it will perform like a scalded dog... for about half an hour, then your engine becomes a boat anchor.
Use any grade with 10% or less ethanol from a reputable retailer who moves a large quantity of product. Beyond that, the choice is up to you.
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