Go to MSN and check your local gas prices. I've used this for several weeks now and find it very accurate. Scroll down to the bottom right side of the screen and click on "gas prices". On the next page enter your zip code and find local pricing. I saved mine in favorites and check it before filling up. Example: Toay the least expensive price was $1.95 and the highest was $2.21. Multiply the differance times my thirsty 30 gallon fill up and I saved $7.80. Well worth to extra 1.8 mile drive to the least expensive station.
Link:
http://autos.msn.com/default.aspx
Link:
http://autos.msn.com/default.aspx