Originally posted by Raiyn
How about "Mind if I tuck in for a while?"
Concur.... Always ask if it's OK to draft and if you're up to it offer a pull.
Here's another fine point of sharing the draft. If you're pulling what appear to be seasoned roadies and want to drop back, let the rider behind you know that you're pulling off and dropping back by using a single, smooth and fluid motion in which you pat your left hip/thigh with your left hand and and then point your left arm out at about a 45 degree angle before pulling off the front. This allows them to anticipate your actions instead of following your wheel, assuming you're just avoiding an obstacle, etc...
If you're unsure of the other rider's knowledge regarding hand signals just tell them, "I'm going to drop back for a little while" and then do the left arm signal.
If you feel you are well-matched riders suggest taking turns for 1mi or 1 minute pulls to level out the work load.