My wife found this site and it helps in deciding where or if we want to go some place. It also helps determine if we want to take the TM or go by car and stay in motels. If you enter the zip code where you want to go it will tell you what to expect to pay for gas. Also, if you figure out the zip codes along the way you can get a better idea what the trip is going to cost.
http://autos.msn.com/everyday/GasSta...9021&x=16&y=11