ORIGINAL: Balsa Steel
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.
I ran my DA50 on Amsoil at 80:1 (couldn't bring myself to use 100:1) for probably 10 gallons or so, and after picking up an Evolution 26GT that wouldn't work with the Amsoil, switched to Mobil MX2T at 32:1. I noticed that the throttle transition was smoother with the change too. My friends thought it was all in my mind, but it was noticeable because I was used to the way the plane was before. Maybe this explains why, it was the carb.