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U.S. Orders Mitsubishi to Revise Future Fuel Economy Tests
Mitsubishi Motors Corp. has been ordered to explain its fuel economy test process for vehicles sold in the U.S. after the company admitted it incorrectly assessed cars sold in Japan for 25 years.
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Mitsubishi Motors Corp. has been ordered to explain its fuel economy test process for vehicles sold in the U.S. after the company admitted it incorrectly assessed cars sold in Japan for 25 years.
The U.S. Environmental Protection Agency and California Air Resources Board also have directed MMC to modify the way it evaluates its U.S models in the future.
Mitsubishi says it fabricated data for some tests by extrapolating fuel economy values from other models rather than testing them separately. The company also concedes it used the wrong procedure in Japan to conduct so-called coast-down measurements of aerodynamic and powertrain drag. Regulators use the data in combination with laboratory tests to calculate a vehicle’s official fuel economy rating.
MMC isn’t the first carmaker to be charged with “irregular” coast-down results. In the past three years EPA has found similar issues with certain Ford, Hyundai, Kia and Mercedes-Benz models and ordered the manufacturers to lower the stated fuel economy ratings accordingly, Automotive News notes.
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