The 2010 Hummer H3T is a 4-door, 5-seat Regular Side, available in 5 trims, ranging from the Crew Cab to the Alpha Leather Edition. Upon introduction, the $30,915 Crew Cab is equipped with a standard 3.7L, 5-cylinder, engine that achieves 14-mpg in the city and 18-mpg on the highway. a Manual transmission is standard. The $39,205 Alpha Leather Edition is equipped with a standard 5.3L, 8-cylinder, engine that achieves 13-mpg in the city and 16-mpg on the highway. an Automatic transmission is standard.