1 Never use a drive through. Ever. Be it a bank, fast food, liquor store idling at a drive through results in increased pollution. Multiply that over the millions of drive through uses that occur in the country over the course of a year and you'll see that drive throughs result in a lot of additional pollution and fuel usage. If people stop using them, businesses will stop building them and we'll all be better off.

2 Don't warm up your engine. Again, excessive idling wastes fuel and creates additional pollution. If you are driving a very old car, you may need to warm it up before driving. But any car made in the last 20 years has been designed so that you can start it and go without having any detrimental effects on the engine.

3 Drive the speed limit. Speeding wastes a lot of fuel. ON the highway, every 10 mph over 55 mph that you go reduces your fuel economy by 10 - 15% (according to the EPA). It's not cool to go slow, but it makes a big impact on the environment.

4 Keep your tire properly inflated. Low inflation leads to increased drag which means that the engine has to work harder to go the same speed. When it's working harder, it's using more fuel.

5 When filling your gas tank, don't top it off. Modern cars have smog equipment that can be adversely affected by topping off the tank. Also, topping off can lead to fuel spills where the spilled fuel will evaporate into the air. Also, when filling up, make sure your gas cap is securely fastened. Again, this will reduce evaporation, and on modern cars this will help the smog equipment work better.