Every time you fill up the car, you can avoid putting more money into the coffers of Saudi Arabia. Just buy from gas companies that don't import their oil from the Saudis.
Nothing is more frustrating than the feeling that every time I fill-up the tank, I am sending my money to people who are trying to kill me, my family, and my friends. I thought it might be interesting for you to know which oil companies are the best to buy gas from.
Major companies importing Middle Eastern oil (from 9/1/00- 8/31/01):
Shell 205,742,000 barrels
Chevron/Texaco 144,332,000 "
Exxon/Mobil 130,082,000 "
Marathon 117,740,000 "
Amoco 62,231,000 "

If you do the math at $30/barrel, these imports amount to over $18 BILLION!

Here are some large companies that DO NOT import Middle Eastern oil:
Citgo 0 barrels
Sunoco 0 "