Find The Lowest Gas Prises
There are lots of websites out there that will help you find the lowest gas prices for your area. Some of them are government sponsored, others more informal. Most of the sites will give you information specific to the city or town closest to you, and many of them are updated every day or two. So you will get the information that is most relevant to you.
Two good sites are fueleconomy.gov, and gasbuddy.com. AAA also has a site that has some great info, and the Energy Information Administration has a site that you might also find helpful.
I do recommend that, like in any search for information, you find the most reputable site that you can. These are often organized by the government or other unbiased sponsor. It's just something to keep in mind when you are looking for reliable information.