If you have an Android device there's a free app called 'GasBuddy' that is awesome. You can use it to sort by nearest or cheapest and all sorts of options. It comes in REAL handy when you're traveling. Check it out and thank me later.
used the crap out of it while traveling to the grand canyon and back. definitely saved me some $$$
All I have in this world is my balls and my word and I don't break em for no one.