Saving Money on Gas
Your car will get better gas mileage when it is well maintained. Dig out your owner’s manual and make sure you are following its recommendations for tune-ups, oil changes, etc. Make sure your tires are properly inflated; you can get a tire gauge at any auto supply store to check tire pressure.
There are also techniques you can use while driving that will lower your gas mileage. This is called hypermiling. Here are some forums where you can learn more.