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EPA Revises MPG Estimates for 2013/2014 Mercedes C-Class 4Matic Models

Motor Trend logo Motor Trend 10/2/2014 Megan Stewart

During a fuel economy audit of the Mercedes-Benz C300 4-Matic, the U.S. Environmental Protection Agency (EPA) found that two models failed to meet the values originally submitted by the automaker for certification. The EPA is now requiring Mercedes-Benz to correct the labels on the two models, the C300 4-Matic FFV and PZEV.

2013 Mercedes Benz C300 4MATIC Sedan© Provided by MotorTrend 2013 Mercedes Benz C300 4MATIC Sedan

Mercedes-Benz made it out with small changes, as each model under the microscope only had to change numbers by 1 mpg (in the PZEV's case, down 1 mpg city and highway). The 2013/2014 Mercedes C300 4Matic FFV drops from 20/27 mpg city/highway to 19/27 mpg, while the PZEV version is down from 20/29 mpg to 19/28 mpg. The combined rating for the PZEV also drops 1 mpg to 22 mpg. Christopher Grundler, director of EPA's Office of Transportation and Air Quality, said in a release that "Even though the adjustments are small, it is important that our oversight system is producing the correct results because even one MPG matters to customers."

But Mercedes-Benz isn't the only automaker in recent times that's had to alter its fuel economy labels. Perhaps the most notable change comes from Ford. The EPA found that its hybrids failed to meet the labeled fuel economy figures. While most of the models were only off by a few mpg, others had to shave off as much as 8 mpg.

For Ford, the C-Max took the toughest hit after the audit, going from 47/47/47 mpg city/highway/combined to a much lower 45/40/43. Other Ford and Lincoln models like the Fusion Hybrid and MKZ Hybrid, respectively, didn't change their numbers as significantly. The reason behind these changes was due to a testing error, like with Hyundai and Kia.

The two Korean automakers claimed a "procedural error" when conducting tests on a host of models back in 2012. A lawsuit was filed against Hyundai, with customers alleging that they were horribly misled about the advertised 40-mpg models.

In Mercedes' case, the EPA says the original numbers submitted underestimated the impact of aerodynamic drag and rolling resistance of the tires. The organization also tested a number of other Mercedes models during its audit and found no other inaccuracies.

Source: EPA

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