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I don't use a web site.
For gasoline, I do keep an eye on the prices of the local stations which are along my driving route and use the cheapest. There is a Costco near work, and I'll always use that if I need to fill up down there. I typically fill up there around closing time, so rarely encounter a wait.
For diesel fuel, I go to the only station near me that offers a Biodiesel blend. It runs about 5 - 10 cents more per gallon than straight diesel fuel, but I am willing to encourage the business. Heck of a lot easier than making my own BioD, which I don't think would be any cheaper anyway if I were to count the value of my time I'd have to put into the entire process of brewing it.
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