Thanks to everyone for your comments on drafting ettiquette and drafting safety. I never ride with a group so I haven't had any opportunity to learn any of this stuff.

Still curious though, as to what you do when you're drafting behind someone (assuming permission and/or you know their riding ability) and it feels too easy for you. Do you shift and make it harder for yourself or take it easy for a bit, in preparation for taking your own turn soon?