Not yet.

I think early on when you're not sure what you're capable of... but you suspect you're capable of more than you think you're capable of (and yes, that is a paradox and I think it even has a special name), then it makes sense to use the SAG as a motivator to keep the "but what if I can't" voices under control. It also means you can push a little harder if you want (tho' I never have... I"m all about pacing and finishing with plenty left).

Oops, once I *sort of* did, in that I rode out *to* the rest stop I was doing the shift on, and there were 20 mph headwinds so I opted not to ride back. It didn't look anything like fun.