I think it would be better to give a one time tax break to buyers that purchase a car with much higher than mandated highway economy. That would #1 turn more profit for the automakers who set out to make more fuel efficient cars. #2 the car buyer would see the benefit of buying a more aerodynamic car and make non-purchasers aware of the improvements that can be had by improving aero. It would suck if we fixed the problem rather than just tell people we can't drive 55.
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