This truck has the LB7 Duramax Diesel engine. A little research shows that this may be the best-most popular light-duty diesel engine on the road. It delivers over 500 foot pounds of torque at only about 1,800 RPM. Thats full torque at about about 1-2 the RPM. A lot of owners claim as much as 24 mpg. highway And 14-16 either in town or fully loaded on the highway. This is the pre-E.P.A. add-on engine. In late 04 the EPA made them add pollution controls that reduced horse power, torque And fuel mileage. It has more bells And whistles than I care to list, including lighted running boards. Yes, you read that correctly, lighted running boards. New tires, too.