Here is a quick link for you to check in your home state. You may have a better web site than this but this is fairly handy. I listed the prices for Alaska but all you do is remove the that is there and place yours there.
www.alaskagasprices.com
www DOT FillInBlank gasprices.com
If you look at Juneau you'll see a WIDE gap in pricing. Funny too in a town this small they did not list Fred Meyer.(these are diesel prices)
update Tesoro $3.49
9102 Mendenhall Mall Rd near none Juneau Sat 3:01 PM
update Safeway $3.69
3033 Vintage Blvd & Clinton Dr Juneau Sat 2:32 PM
update Petro Express $3.77
5165 Glacier Hwy & Lemon Creek Tr Juneau Sat 3:32 PM
update Taku Fleet Fuel $3.90
5631 Glacier Hwy & Tonsgard Ct Juneau Sat 12:05 PM
update Mike's Airport Express $4.02
9190 Glacier Hwy & Lee Smith Dr Juneau Sat 3:23 PM
What I find even more interesting in the pricing of diesel is when traveling through Yukon and BC diesel is cheaper than gasoline, which it should be. Basically the petroleum companies are giving it to us with out any lube.