This feels more like a political statement than a researched perspective. Is there proof that the F-150 of perhaps 2007 is smaller than that or 2012? Did the truck sizes change to become smaller once the emissions rule was revoked?
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The truth, of course, is that ALL car and truck sizes in the US have been rapidly increasing for several decades now, and Obama had absolutely nothing to do with that. Pickup-truck culture had a lot to do with it, but isn't entirely to blame: look at the current Honda Civic vs. a 1980 model or a 1990 model.