Andre Gunther wrote a great article on 29 ways to save gas, worth reading. This is actually a good article, unlike some of the crazy news channels that hook you into watching the news just to tell you to keep your foot out of it and air up your tires.
http://www.opentravelinfo.com/travel-guide/uncategorized/how-to-save-money-on-gas-29-tips.html
Enjoy!