1) Slow down. Definately #1
2) FAS if safe to do so (for both you and your car) on downhills and when coasting to a light, stop sign or left turn. Very important in hilly areas, not so important for flatlanders.
3) Conserve momentum (drive as if brakes failed, SAFELY). This includes curves and trying to time stop light so you don't hafta stop.
4) Learn your route and try new things. Nothing like the homefield advantage.
5) Maintain your car, check tire pressure (high as possible), oil (as lightweight as possible), spark plugs/wires, etc.

You can draft or surf but I think those are dangerous.