To add to the debate, I was talking to Mike McMurtry about what he and Sean use. To my surprise, he said they were using Amsoil at 100:1, and had been for years. He said they've run several hundred gallons of the mix and never had any problems with it. He did say however, that they changed over to regular old Lawn Boy at 32:1 recently. The reason for the change was that the Walbro carb was designed to meter fuel with a heavier viscosity than the 100:1 mix yields. He said the 32:1 mix did help smooth the throttle transition.

Take that for what it's worth. I'm still one of those "more oil is better" guys.