Hypermiling

If you haven't heard of it by now, you will soon. It's been on the news and it's growing in popularity as gas prices spiral out of control. It's a way to eke a few more miles per gallon out of your existing vehicle if you can't afford to upgrade to a hybrid or downgrade to a stickshift.
Hypermiling 101
1. Put your car in neutral and coast down hills.
2. Put your car in neutral and coast to a stop at stop signs.
3. Refrain from using your brakes.
4. Turn off your defrost/AC when you can. Roll down your windows.
5. Drive 55 on the highway and use the cruise control.
6. Lighten your car by taking heavy things out.
7. Draft off of bigger cars.

Warning: It is very irritating being a passenger in a car with a hypermiler.