Hi downunder,
So far I've run it on Shell, Mobile, and Sunoco, all with the same results. Don't tell the gas companies as they spend a lot of money on advertizing to us how each one is better
As far as I'm concearned it has been all downhill since they did away with good old leaded Sunoco 260. But for the most part it's safe to say that any premium pump gas will be fine in it. I myself tend to stay away from the off-brands in any 2 cycle whether it be a weed whacker or outboard motor, like oil, it's cheap insurance.