Just came across this smart phone application GasBuddy.com recently and LOVE it! I have been using it all weekend and finding it is accurate too! You can locate gas by price and distance. With the way gas prices are going I found within a few blocks a .10 difference in gas prices at various locations. Good stuff to know!
And if you help update with prices and photos you can earn points towards – FREE GAS!
They also provide Top Ten Fuel Saving Tips