> Late in April, Nissan revealed that Mitsubishi had been artificially boosting its official fuel economy ratings by up to 10 percent by overinflating tires during testing. At first, the act was thought to only affect about 600,000 Japanese-market kei-cars, tiny city vans with 660cc engines—470,000 of which were built by Mitsubishi but sold with Nissan badges.
Things unfolded from there. Within a week, Mitsubishi admitted that the fuel economy deception reached all the way back to 1991, a systematic effort affecting untold millions of vehicles. By mid-May, the Japanese automaker announced …