2017 GMC Acadia Caught High Altitude Testing? - GM Authority (blog)

Seems like GM would be encouraged to use turbochargers more by driving up here. At 10,000 ft, those naturally aspirated engines aren’t exactly “brimming” with horsepower, even the mighty 6. 2 is in the (upper) 200 horsepower range, if you do the math. Source: gmauthority.com