I never buy gas at Citgo stations because of the money going largely to the Venezuelan government and Chavez. Up until now that was the extent of my politically-based decision making in regards to oil and gas purchases. There is a better alternative: Terror-Free Oil. Somebody had the bright idea of starting a gas station that sells only oil purchased from non-terrorist-supporting/non-Middle East states, and advertising the status of that gasoline as a marketing ploy. They also provide a percentage of the station's profits to anti-terrorism efforts and have a green/alternative agenda, supported from the profits. I got the info from a Reason article by Katherine Mangu-Ward.
The only Terror-Free gas station available now is in Omaha, Nebraska. If I could find one where I live, I would buy my gas there. If I could swing the money to invest in a new franchise, I'd do so, as well. In the meantime, check out the website for info on which gas stations buy oil from terror-supporting states and from the Middle East, and which do not. It might help you make an informed decision. I really love this idea! I hope the idea works and catches on!