It'll be a waste of time and paper. People don't read flyers at gas stations. They drive up, hop out of thier car, walk three feet to the pump, swipe thier card, pump thier gas and drive away.
You'd have to actually stick the flyers on the gas pumps themselves for anyone to even see them, and they still wouldn't read them.
People at bike shops and college campuses are already fully aware of the idea of commuting by bike. If they're not doing it, it's going to take more than a few lines saying "It's fun and easy!" to convince them.
And no one's going to read a full-page essay on bike commuting off a flyer. They might read a short list of bullet points, but that's not likely to convince anyone to change something they've been doing everyday for years.