I would recommend premium gasoline, as we have encountered a few engines that experience some detonation without premium gas. As far as 10% ethanol, I don't think it would be a problem, though if you had been running gasoline without ethanol before, you will probably have to richen the mixture up a touch.

Otherwise, all the pertinent info about the proper fuel mix and such are on the very first post of this thread.

Hope this helps,
AV8TOR