( http://www.TFLtruck.com ) The 2016 GMC Canyon Duramax diesel is the upscale cousin to the Chevy Colorado Duramax. They share the same engine and transmission. How efficient is the midsize turbo-diesel pickup truck? EPA and/or GMC have not released final numbers yet. However, Nathan Adlen does an impromptu test run and gets the following results in this First Drive Review.