2013 Ford C-Max (Ford Motor Co.)
Ford has announced that it will be lowering the fuel economy ratings on a number of its 2013 and 2014 model year vehicles after an error was discovered in the company's internal testing data. The EPA has been notified.

Worryingly for Ford, the vast majority of the vehicles affected are hybrids, including the C-Max, Fusion and MKZ in both hybrid and plug-in varieties (where applicable). Also covered as part of the rerating is the entire lineup of 2014 Fiesta engines, with the exception of the ST, including the turbocharged, three-cylinder EcoBoost.

The Fiesta range is seeing corrections of one to two miles per gallon in the combined rating. C-Max Hybrid models are seeing their combined rating decreased by three mpg, the Fusion's drops by five mpg, and the MKZ drops seven mpg. Both the C-Max and Fusion Energi models have had their ratings slashed by five mpg. Ford critics will note that this is the second time in less than a year that the Blue Oval has had to recalculate the economy ratings for the C-Max Hybrid. That car was originally rated at 47/47/47 mpg (combined/city/highway), which was dropped to 43/45/40 last year and now to 40/42/37.

"This issue highlights the need for continued strong oversight of the fuel economy labeling program," Chris Grundler, director of the EPA's Office of Transportation and Air Quality, said in a statement. "Consumers need to trust that fuel economy window stickers are giving consumers reliable and fair estimates of real world fuel economy."

The problem cropped up in what's known as the Total Road Load Horsepower. According to Ford, TRLHP is specific to each vehicle, and is used as a measure of resistance in dyno testing for fuel economy ratings. Apparently, Ford discovered that the TLRHP used on the vehicles affected was incorrect. There were also issues with the way wind tunnel testing was factored in to the dyno resistance rating. In Ford's case, it seems like they're trying to pull a Hyundai and Kia and take the honest way out by acknowledging the fault.

"Ford is absolutely committed to delivering top fuel economy and accurate information," said Alan Mulally. "We apologize to our customers and will provide goodwill payments to affected owners. We also are taking steps to improve our processes and prevent issues like this from happening again."

We've got those goodwill payments available below in a table. You can also take a look at the press releases of both Ford and the EPA, which includes a complete breakdown of the re-rated economy figures.

This article originally appeared on Autoblog.com


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