i run 100:1 opti2 from day one. 4 motors on 4 bikes and haven't had a problem yet.
let's not turn this into another Opti2 thread, though.
BUT, as far as being "green," check out what their website has to say:Opti-2
"... the most environmentally friendly two-cycle mix oil available.
Opti-2's smoke reduction, and gasohol compatibility contribute to cleaner air, while up to 60% less oil is required, which helps conserve a precious non-renewable resource."