Which Automakers Could Be Fudging Their EPA Mileage Numbers?

An executive of one U.S. automaker suggests there might be some sleight of hand going on and that the EPA is not catching the offenders.

The issue: There's a noticeable difference between the mpg number posted on some cars' window sticker and an analysis of the data submitted by automakers to the EPA.

The executive raised a red flag earlier this year. He told me his company was unable to replicate the city, highway and overall fuel economy numbers achieved by some automakers for their 2011 car models.