EPA to release audit of vehicle mpg numbers this fall

Article by Anita Panait, on October 7, 2013

The United States Environmental Protection Agency is preparing this fall to release to the public an audit of carmakers’ fuel economy claims.  Christopher Grundler, head of the EPA's Office of Transportation and Air Quality, told Automotive News in an interview last week that the results of industry-wide audits included tests on over 20 car and light-truck models this year.

The audits were done at tracks in Arizona and Michigan and were intended double-check carmakers' readings on the "coast-down" test, which turned up problems with the mpg figures on several Hyundai and Kia's window stickers in 2012. Grundler said he can't comment on the EPA findings until he talks to his bosses and briefs executives from carmakers.  He, however, said that the report "will be very interesting to some people."

The coast-down test involves speeding a vehicle to around 80 mph and then allowing it to glide to a stop. This process measures the aerodynamics of a vehicle, the rolling resistance of its tires and the amount of friction in its drivetrain.  The measurements are used to program a dynamometer to run the vehicle through the EPA's test cycles and come up with mpg estimates. 

There has not been a regular audit of the coast-down figures that carmakers submit until 2010, when Grundler's predecessor, Margo Oge, ordered an initial round of audits aimed at deterring cheating at a time when customers are increasingly factoring in fuel economy in their buying decisions.  The EPA has already briefed carmakers on audit of their cars in the summer, but the release this fall would be the first time that the figures would be made public.

Topics: epa

If you liked the article, share on:


Login or Create new account to add a comment!


Many have been anticipating Mercedes-Benz Vans’ newest luxury pickup truck, the X-Class. While Mercedes-Benz has yet to reveal the official production version of the X-Class, it was kind enough to...
by - October 27, 2016
We’ve seen quite a lot of intriguing stories in the age of Internet (where the most interesting part was revealed before the story unfolds). Some are from movies and novels...
by - October 26, 2016
Many people have long known that the new 2018 RS5 was being developed by Audi AG. Enthusiasts the world over were excited when a prototype was seen running on the...
by - October 26, 2016
It was only recently when BMW officially debuted the new 2017 5-Series Saloon (G30) online. At that time, this range revealed that it had driving dynamics that was the best...
by - October 26, 2016
Starting early 2017, the new Audi Q7 will be available with the new 2.0-liter TFSI four-cylinder engine that makes it not only faster but also lighter and more efficient than...
by - October 25, 2016