Drafting

There is nothing cheating about drafting. Riding with someone on your wheel is a responsibility and riding someone's wheel is a gift. Friends regularly take responsibility for each other and give each other gifts - it's what makes them friends.

Ever wonder why the camaraderie amongst roadies? It's because of the drafting. The guy in front must take responsibility for the guy in back, and the guy in back must trust the guy in front. It's that give and take which forms the bonds of road cyclists and why road cyclists have a different vibe from, say, mountain bikers, and why, yes, sometimes roadies come off as a bit insular to newbies. It's all in the trust/responsibility dynamic of drafting. If one person can't be trusted in a pace line, he gets sent to the back where he can't do any damage while the rest of the guys rotate their pulls.

And even if it's just you and a friend, draft without guilt; just trade off every couple minutes to keep everything on an even keel. And if one of you is significantly stronger than the other, have the weaker one ride the stronger one's wheel a larger percentage of the time and the effort of a fast ride is apportioned evenly according to ability.