A new admission from Mitsubishi Motors has widened a scandal engulfing the company.<br /><br /> Managers have now admitted they have been using an improper fuel-efficiency testing method since 1991.<br /><br /> The company says this concerns the domestic market and the number of vehicles involved is not known.<br /><br /> Last week Mitsubishi admitted submitting misleading data on the fuel efficiency of more than 620,000 cars.<br /><br /> Its offices have been raided by Japanese authorities and US vehicle safety authorities are now asking for more information.<br /><br /> The company is the world’s sixth-largest car manufacturer and the new revelations have plunged it into crisis.<br /><br /> Forty percent has already been wiped off Mitsubishi’s value on the markets.
