Think out your trips
Why rush to stop signs? Believe it or not, it is a gas waster. If you are approaching a stop, take you foot off the gas. If you anticipate stops by removing your foot from the gas, that coasting will save you money - on brake wear too.
Okay, okay. That is a pretty obvious one. The reason I mention it is because it is so easy to forget when you pull in the driveway and want to hear the rest of a song, or when you are about to leave and release that you forgot something in the house. At those times we often mindlessly leave the engine running. The thing to remember though is that the miles per gallon while in idle is zero, zilch, nada.