Japan’s transport ministry says that Mitsubishi continued to botch fuel economy figures of its vehicles even after admitting to manipulating testing data to improve mileage results.
Back in April, the automaker announced that four of its minicars sold in Japan had had their test data manipulated to provide better fuel economy numbers. Immediately after, the country’s transport ministry instructed Mitsubishi on the proper way to test its cars but in the preceding month, it failed to do so.
While speaking with The Wall Street Journal, the head of the ministry’s road transport division, Naoki Fujii said “We cannot help but feel concerned that these points haven’t been improved.”
In Japan, carmakers are required to conduct five road tests and then calculate the average of the returned median numbers to arrive at an official fuel economy figure. Despite this, Mitsubishi only used the average of the best fuel economy values for one of its minicars and for another, did more than the prescribed five road tests.
In the fall out, it was discovered that Mitsubishi found similar data errors dating back to 1991.
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