I usually ride to work and arround town. I use 85 or 87 and get about 44mpg. I have HK pipes, K&N filter and a cobra FI2000. Last weekend I went on a 3 hour trip and got 51mpg on the highway with 87. The manual recommends 87 or higher and to stay away from anything with more than 5% methanol (wood alcohol) We have ethanol here which is corn alcohol. Stay away from anything greater than 10% ethanol. We have a few places here in town that carry 95 and 97.
Prety much whatever you want to use, you'll be fine.
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