Mind your maintenance. A well-tuned car burns less gasoline, so get your oil and air filters changed regularly.
1. Not sure if your filter needs changing? Take it out and hold it up. If you can't see any light coming through, it's too dirty.
2. Check your tire pressure monthly (you'll get the most consistent results by using your own gauge when the car is cold). Americans driving on underinflated tires waste 4 million gallons of gas each day and reduce their tires' lifespans.
3. Oil-change shops urge us to change the oil in our vehicles every 3,000 miles, but most cars nowadays don't need oil changes that often. In fact, most manufacturers say you can go 7,000 miles without a problem. Change less often and it really can save your engine and the planet - not to mention your wallet.