This is a small step that won't really make a huge difference at first, but over time, it'll be saving you gas and money. Little steps. Park and go inside of Taco Bell, instead of sitting in line, waiting for the drive-through. Turn your car off, when you're waiting in the driveway for your friend. Stuck in a gridlock? Cut the power. If you're letting your car warm up, make sure you only wait a few minutes and don't forget. Simple, but effective.