Several reasons I didn't do that though:

My truck needs an oil change
I got it in November, it already has over 10k miles on it, and it probably averages two weeks a month parked in the Dulles airport garage. I don't really need to add more miles.
It's supposed to snow at home tomorrow and Virginia drivers absolutely lose all sense when so much as a flake falls. I'll take my chances with the airlines.
It's more frequent flier miles! Free trip to Tahiti for the wife and I here I come! =P