Sometimes I find myself stuck behind another rider for stretch where there isn't an opportunity to pass. But I sure as hell don't latch on to their wheel close enough to draft - I hang back out of courtesy and for safety. And when I do pass, I allow ample room, announce, and say good morning as I go by. Since I get passed more than I pass others, I figure it's wise to pay forward some good karma. I don't get the jackasses that blow by you close enough to rub jerseys when there is ample sapce and time to make the pass. Lots of TDF delusions out there, I guess.