We have said it before, and we will say it again - checking your tire pressure is one of the easiest ways that you can green your driving. However, even the most prudent of us forgets to pull out the tire gauge every 30 days. That can, of course, lead not only to decreased fuel efficiency, but to some serious safety concerns as well. You would think that by now, your tire pressure would be checked by your car just as your car gauges gas and oil. Well, finally, it will. Starting in all 2008 models, autos sold in the U.S. will be equipped with a TPMS, or tire pressure monitoring system. When your tire pressure is low, your car will automatically warn you by lighting up a signal on your console. Making sure you are properly inflated will be just as easy as making sure you still have fuel.