Graph of the day: Americans buying more fuel- efficient cars, polluting less
New cars bought in the fall of 2012 are using about 15 percent less fuel per mile than cars purchased in 2007. But they’re also logging slightly fewer miles overall — a sign that Americans aren’t just negating the fuel savings by driving more. Add it all up, and there’s been a 20 percent drop in greenhouse-gas emissions from new vehicles in the past five years.
How much of a difference does this make in the grand scheme of things? Brand-new vehicles, after all, are only a small portion of the overall U.S. fleet. Yet in a recent paper, Sivak and Brandon Schoettle estimated that recent efficiency upgrades have already reduced carbon-dioxide emissions from all U.S. light-duty vehicles by about 2.9 percent.
Combine that with the fact that Americans have been driving fewer miles overall, and that’s a small but real improvement as far as oil use and climate change are concerned.














