You just opened "the" can of worms. In my experience, if you run a high grade ester based synthetic, 50:1 or even 60:1 is fine for trail riding (like Motul 800, Amsoil Dominator, redline, etc.). If you're racing then drop the ratio down to 40:1 or 32:1. That's what the oil manufactures generally recommend on the bottle - and they have no incentive to recommend raising the ratio when riding at less than race pace.
Fredette rides the piss out of his bike at 50:1 with very little wear.
I mostly trail ride and run Amsoil Interceptor at 50:1.
Just my 2 shares of Enron.