Reduce your commute by moving closer to work or working closer to home. This will save time as well as money. You may even be able to save even more money by becoming one-car family.
Combine trips. If you can do several short trips in one longer trip, you will save fuel and time. Make lists to avoid having to go back. Call ahead to avoid wasted trips.
Walk between stops. Once you get into town, some of your stops may be near each other. Park between some or all of them and walk.
Park in the first spot you find. If you wander all over the parking lot looking for that really close parking space, you'll use more gas. Don't be afraid to walk a ways if it comes to that - the walk will do you good!