Mitsubishi’s fuel testing procedures are once again in the spotlight, as reports of manipulated of results continue
20 September 2016

Mitsubishi faces fresh allegations of fuel economy test rigging, with the Japanese transport ministry suggesting the manufacturer has continued to manipulate results since it uncovered evidence it wasn't following correct test procedures earlier this year.

The Japanese car maker admitted that it had been manipulating its mileage and economy figures, but, according to reports in the Wall Street Journal, subsequent economy tests in May were also undertaken incorrectly.

Japan’s transport ministry reportedly accused the car maker last Thursday of continuing to test the fuel economy of its vehicles in the wrong way, despite it admitting its faults back in April.

Read more on the Mitsubishi fuel economy scandal here

Mitsubishi admitted to the manipulation of test data on four of its popular minicar models sold in Japan, resulting in 620,000 vehicles being certified as more fuel efficient than they actually were. Immediately following this revelation, Japan’s transport ministry advised Mitsubishi on the correct way in which it should be testing its cars, but the firm allegedly continued to doctor the figures one month on.

Japanese regulations state that car makers should conduct five road tests to calculate an average fuel economy figure for that vehicle. One example of manipulation of the fuel economy figures was that Mitsubishi was using the average from the collective ‘best’ results. Another showed testers to be "unaware" of the five-test limit, resulting in another eight Mitsubishi vehicles being marketed in Japan with the wrong fuel economy figures.

No Mitsubishi models sold in the UK are affected.

Read about Mitsubishi's Paris-bound concept car here

A recent investigation commissioned by Mitsubishi into its own fuel economy figures showed that the ‘errors’ went back as far as 1991, while one employee's requests for the car maker to stop lying about its test results was allegedly ignored in 2005.

Danni Bagnall

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • First Drive
    21 March 2018
    The new Vantage has been developed as a Porsche 911 beater, and our first taste on UK roads suggests it can live up to that bold claim
  • Nissan Leaf Tekna
    The is the new Nissan Leaf
    First Drive
    21 March 2018
    The new version of the world's best-selling electric car gains a bigger battery and more power. How does it compare to rivals such as the Volkswagen e-Golf?
  • Range Rover p400e
    First Drive
    20 March 2018
    The original luxury SUV is now available as a plug-in hybrid, promising lower emissions and the capacity for silent electric motoring
  • BMW i3s
    Car review
    20 March 2018
    Revised hatchback sets out its range-extended electric stall in a new, sportier tune
  • BMW X2
    This is the new BMW X2
    First Drive
    20 March 2018
    Doesn’t deliver many typical crossover selling points but looks perky, handles keenly and is well capable of winning over your latent cynic