RAY: Here's the answer. What these trucks are doing is something called drafting. The trucker that's in front is actually encountering most of the wind resistance. And the other trucks behind him are actually being drafted or pulled along by him.
RAY: And when they do this, those trucks actually get better mileage, and they can go farther and faster on less fuel. And interestingly the guy in front is also getting better mileage, because they're pushing him along, believe it or not.
RAY: But when one of them pulls out to pass he's no longer being pulled along by his buddies, and in fact he is now encountering all that wind resistance, and even though he doesn't want to, he slows down. He can't help it. So it wasn't for spite, it's just the way it works. Do we have a winner?
TOM: Yah. Our winner this week is Dorothy Smith from Bethany, West Virginia. And for having her answer selected at random from among all the correct answers that we got, Dorothy's going to get a $26 gift certificate to the Shameless Commerce Division at cartalk.com, with which she can get a boxed set of 'Disrespectful Music' CDs.
RAY: Congratulations, Dorothy!
[ Car Talk Puzzler ]