Actually, according to the statistics, the US gets 90% of their oil/pertolium from south america, not the middle east, basically it's just gotten too expensive to get from the middle east lately. This is another reason why President Bush is so slap happy to go to war in Iraq.....
Any way, I wouldn't bother boycoting any specific brand of gas, as, more than likely, you'll never really know where they get all their oil from, and even if you could make the assumption that they got it from the middle east, I don't think the the Type-R owners of the world would put a significant dent in their sales....
Later,
Aj