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Says snopes.com - Oil companies can manipulate their prices somewhat by controlling how much gasoline they produce and where they sell it, but they can't alter the basics of supply and demand: prices go up when people buy more of a good, and they go down when people buy less of a good. The "gas out" schemes that propose simply shunning one or two specific brands of gasoline won't work, however, because it's based on the misconception that an oil company's only outlet for gasoline is its own branded service stations. That isn't the case -- gasoline is a fungible commodity, so if one oil company's product isn't being bought up in one particular market or outlet, it will simply sell its output to other companies:

Then snopes.com says - The only practical way of reducing gasoline prices is through the straightforward means of buying less gasoline, not through a simple and painless scheme of just shifting where we buy it. The inconvenience of driving less is a hardship too many people apparently aren't willing to endure, however.

Snopes is not consistent. Their advice to buy less gasoline in order to reduce gasoline prices violates the law of supply & demand that they cited earlier in their response.

I disagree with snopes anyway. If freeping consumers avoid buying Mobil for a month, all of us during the same month, all those little expressy, quicky, Mobil stations are going to be in a world of hurt, and can be compelled to do something about their gasoline pricing. If we then target Exxon, Texaco and the other biggies in successive months something will have to give at each company, or we hit them with another boycott.