General Motors admits their estimated gas mileage for certain 2016 SUVs was a bit too optimistic. To make up for the snafu, the automaker will pay up or offer warranty extensions to 135,000 owners, including those with a Traverse.
In May of 2016, GM told its dealers to stop selling 60,000 vehicles after discovering the discrepency while working on the labels for the 2017 model year. The window stickers show estimates 1-2 miles per gallon higher than they should.
This problem has popped up in the following Chevrolet generations.
Most years within a generation share the same parts and manufacturing process. You can also expect them to share the same problems. So while it may not be a problem in every year yet, it's worth looking out for.