"Unlike coffee," she writes, "gasoline does not have a 'Fair Trade' label, the seal of approval that tells us better trading conditions and sustainable practices were embraced in the making of the product."
Exxon has funded climate-change denial; Shell's been in trouble for human rights violations; Chevron, as we've seen in Joe Berlinger's Crude, is embroiled in a tragic environmental and social quagmire in Ecuador; and all five major oil companies have clean-up plans along the lines of BP.
In the absence of a good choice, the best course of action is simply to use less gas.
Head to Grist for more information on the topic of responsible gas purchasing.