well, you asked. if you didn't ask, if you got stuck with your petcock in reserve position, you ran out of gas somewhere in the boondocks, then you definitely would not have felt like an idiot. after you either waited, got a ride, had someone take gas to you, walked for sometime, then, you would have felt like an idiot for not having asked.
ride safe, enjoy your ride, knowing that if you do switch to reserve, you at least have 20 miles before the next station to get gas!!!