MashGet

WASHINGTON—Billed as a way for the government to put more fuel-efficient vehicles on highways, the popular $3 billion Cash for Clunkers program mostly involved swaps of old Ford or Chevrolet pickups for new ones that got only marginally better gas mileage, according to an analysis of new federal data by The Associated Press.

The single most common swap -- which occurred more than 8,200 times -- involved Ford F150 pickup owners who took advantage of a government rebate to trade their old trucks for new Ford F150s. They were 17 times more likely to buy a new F150 than, say, a Toyota Prius. The fuel economy for the new trucks ranged from 15 mpg to 17 mpg based on engine size and other factors, an improvement of just 1 mpg to 3 mpg over the clunkers.