The 2005 Chevrolet Silverado 1500HD LT Crew Cab Short Bed 4WD has a 6.0 L, 300 hp V8 engine.  Gas mileage comes out to 14 mpg in the city and 16 on the highway.  This trim has 4 doors, seats 5, and tows up to 9900 lbs.  Think of the LT as a more upscale version of the LS.