The 2017 GMC Canyon is a 4-door, 2-seat Regular Side, available in 21 trims, ranging from the SL 4x2 Extended Cab to the Denali 4x4 Crew Cab Long Box. Upon introduction, the $20,940 SL 4x2 Extended Cab is equipped with a standard 2.5L, 4-cylinder, engine that achieves 19-mpg in the city and 26-mpg on the highway. a Manual transmission is standard. The $43,120 Denali 4x4 Crew Cab Long Box is equipped with a standard 3.6L, 6-cylinder, engine that achieves 17-mpg in the city and 24-mpg on the highway. an Automatic transmission is standard.