Just to be clear, I didn't write this article or do any of the research for it. Therefore, it has useful information. Here's a link to the original: Common Dreams News Center.
The general idea is this. We still have to buy gasoline somewhere. Hugo Chavez, the president of Venezuela, has promised to use his nation's oil revenue to benefit the poor. (Wouldn't you just faint if you heard something like that from U.S. elected officials?) Citgo gas stations are a wholly-owned subsidiary of Venezuela's state-owned oil company. So, money you spend at Citgo pumps contributes to health care, education, and other services for the people of Venezuela.
Of course, your car still pollutes no matter where you buy your gas. We clearly still have work to do. Lots of it. But in the meantime, while reducing your consumption, you can at least do some good.
In this area, the Citgo stations are the two Road Rangers and the 7-11 over by campus.