Chait joins the externalities debate. Drum adds:
If you were to sum up the cost of IQ losses from leaded gasoline (now gone, of course, but the effects live on), the asthma epidemic among today's kids, military protection of the Middle East, global warming, garden variety smog, plus all the more prosaic things like traffic jams and so forth, I wouldn't be surprised if the real cost of a gallon of gasoline would have to go up by three or four dollars to pay for it all.
Map on per capita state gas consumption by Martha Kang McGill of Infrastructurist.com.
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