GM Accused of Manipulating SUV Fuel Economy For Seven Years

After GM announced last month they would issue a stop sale of new Lambda based crossovers due to incorrectly calculated fuel mileage–some owners of older Buick Enclave, GMC Acadia and Chevrolet Traverses have now filed a potential class action lawsuit against the General.

While GM admitted and began the process of compensating owners of affected 2016 vehicles, the suit now alleges from 2009-2016 GM overstated fuel economy on it’s Lambda based crossovers.

“All of the Chevrolet Traverse, GMC Acadia, and Buick Enclave vehicles for model years 2009 to 2016 were represented to have the same inflated gas mileage,” the suit states. “Yet all have substantially the same engines, weights, sizes and shapes and, thus, should achieve substantially identical gas mileage.”

The suit accuses GM of inflating fuel mileage in advertisements in order to charge a premium for the vehicles.

The crux of the suit hangs on GM’s stated fuel economy figures for the Buick Enclave, GMC Acadia and Chevrolet Traverse dating back to 2009.


Since 2009, the suit claims weight, engine, size, and shape of the Lambda triplets has been substantially similar for each model year. “Fuel economy performance depends primarily on vehicle weight, engine, size and shape.”

Essentially what the lawyers are saying: If the 2016 is largely unchanged from the 2015, as the 2015 is largely unchanged from the 2014 and so on and so forth, then GM’s revision of the 2016 fuel economy is an admission of manipulation dating back to 2009.

“Following GM’s revision of its fuel economy ratings for the 2016 vehicles, GM now admits the 2016 Enclave, Acadia, and Traverse achieves worse gas mileage than it claimed for the same vehicles from model years 2009 to 2015. ”

In all, the suit claims the allegedly misstated fuel economy numbers will cost owners approximately $300 more per year, or more than $2,400 during the minimum useful life of such vehicles.

If proven to be true who knows how deep the rabbit hole goes– and not just at GM…