I recall seeing a paper at some point that found a Peltzman effect for higher automobile gas mileage--i.e., when automobile gas mileage rises, people live further from work and have longer commutes, thereby dampening some of the reduction in fuel consumption that might otherwise occur. I also seem recall a finding that this increase in commute time also leads to more accidents as a result of greater driver fatigue.

Note that I am not looking for the classic Peltzman effect example about car safety and more accidents, but rather any countervailing effect related to gas mileage and the effect on fuel consumption.