The 2008 GMC Canyon is available as a 2-door, 3-seat regular side. Starting at $19,080, the 2008 GMC Canyon SL 4x4 Regular Cab is powered by a 2.9L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway. The top of the line 2008GMCCanyonSLT 4x2 Crew Cab 1SE High Stance Off-Road , priced at $ 21,465 , is powered by a 3.7L , 5 - cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 22-mpg on the highway.