In the words of Bob Lutz, this is a crock of shit:
If these differences in standard of living and transportation density are normalized, America's per-capita greenhouse gas emissions would not be much different from western Europe. And here lies the main paradox of the misperception on this issue: it is precisely because the United States is highly energy efficient that we are able to afford and consume more energy than European nations on a per-capita basis. One obvious implication of this analysis is that the United States cannot currently achieve European-level greenhouse gas emissions unless it reduces American output and lowers the nation's standard of living.
If we average suburbs and exurbs in with uninhabited desert, decades worth of piss-poor planning that has benefited the automobile industry can be wiped away and we'll look at least as efficient as those Yurpeens!