Americans bought more gas guzzlers in April than in previous months. A University of Michigan study found that the average fuel economy (according to the window sticker -- more on that below) is at 23.9 miles per gallon. That's .2 m.p.g below the March average, and the first drop since December. Overall fuel economy for American cars sold has been trending higher over the years with occasional dips and drops (see chart). April's average is nearly 20 percent higher than in 2007 when U. Mich started tracking the gas mileage of autos Americans buy.
The authors posit that a slight drop in gas prices spurred this slip backwards on m.p.g. as Americans felt more comfortable plunking down cash for bigger cars.
As you digest this American m.p.g. news, consider a German study from earlier in the week that finds automakers are exaggerating fuel efficiency claims for their cars, and doing it more boldly then in the past. The study finds that in 2001 carmakers claimed 8 percent more fuel efficiency than drivers got in practice. In 2012, that jumped to a 21 percent gap between promise and practice. Something a few drivers have taken seriously enough to sue over, and win.