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We tend to consume in proportion to what we can afford. Europeans don't drive smaller vehicles because their DNA has been infused with extra righteousness. If we were to have grown up in Europe, we'd be driving the smaller cars for the same reasons they are, and if they had grown up in the US, they would be driving larger vehicles.
It will take either policy or prices to make large vehicles undesirable to consumers. In my view, if we want MPGs to go up, then fuel prices must increase via taxation.
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