In the wake of Ford lowering the EPA combined city/highway mileage by 4 mpg for the 2013 C-Max Hybrid, the EPA plans to hire some 40% more employees to audit gas mileage and revamp its rules on what needs to be tested.
Amid Complaints, Ford to Drop C-Max Hybrid to 43 MPG
Chris Grundler, who directs the EPA's Office of Transportation and Air Quality, told USA Today the agency will "update general-labeling regulations" — the crux of the issue for the C-Max rerating.
The EPA elaborated Thursday in a press release: "Developed in 1977, EPA label regulations allow, but do not require, vehicles with the same engine, transmission and weight class to use the same fuel economy label value data, since, historically, such vehicle families achieve nearly identical fuel economy performance." As we reported in a 2012 investigation, carmakers can voluntarily rerate cars — which, for example, Toyota does with its Prius variants, according to USA Today. But they don't have to.