The National Highway Traffic Safety Administration wants to make sure Mitsubishi doesn't falsify fuel economy ratings in the US like the company does in Japan. "We've requested information from Mitsubishi about this issue," a NHTSA spokesperson told Reuters. The person didn't provide details about the specific models the regulator wanted to know more about.

At this time, there's no evidence of fuel economy inaccuracies for any North American models. The affected vehicles in Japan so far are 625,000 small kei-class cars, including the Mitsubishi eK, eK Space, Nissan Dayz, and Dayz Roox, which Mitsu produces for Nissan.

However, Japanese regulators are taking a closer look at other models and gave the company a week to hand over test data. A newspaper there claims Mitsubishi allegedly used "non-Japanese test methodology" on the RVR, Outlander, Pajero, and Minicab MiEV.

NHTSA's look into Mitsubishi comes at the same time the Department of Justice is scrutinizing Daimler for possible emissions anomalies. "Daimler will consequently investigate possible indications of irregularities and of course take all necessary action," the German automaker said in a statement. The company asserts the DOJ's inquiry is unrelated to a lawsuit from owners, which alleges the BlueTec emissions control system is designed to turn off at low temperatures.

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