Chevrolet Silverado vs GMC Sierra: Specs Compared

Running cost over five years: at the EPA's 15,000-mile-a-year assumption the Chevrolet Silverado burns about $1,100 of fuel annually against $1,100 for the GMC Sierra. That $0 yearly gap compounds to roughly $0 over five years and $0 over eight — often more than the price difference between two trims of the same vehicle, and the single largest running-cost line item separating these two.

City and highway economy: the Chevrolet Silverado leads in both cycles — 78 mpg city and 63 mpg highway against 75 and 61 mpg — so its fuel-efficiency advantage holds whether you commute in traffic or cover long highway miles.

Powertrain choice: the Chevrolet Silverado is recorded with 4 distinct engine configurations (SIDI, w/ Sport and Off Road Mode, 3.0), the GMC Sierra with 4 (SIDI, 3.0, SIDI; FFV). Across 300 recorded Chevrolet Silverado configurations and 274 for the GMC Sierra, the wider the engine spread the more the real-world fuel efficiency depends on which version you actually buy, so check the specific model year and drivetrain rather than the headline number.

Drivetrain and class: the Chevrolet Silverado is offered with 4-Wheel Drive, Rear-Wheel Drive, All-Wheel Drive, the GMC Sierra with 4-Wheel Drive, Rear-Wheel Drive. All-wheel drive typically costs one to two mpg combined against the same vehicle in front- or rear-wheel drive, which is worth remembering when the gap between these two is small. The EPA classes them as Standard Pickup Trucks 4WD and Standard Pickup Trucks 4WD respectively — the class drives the interior volume, cargo space and passenger space each one is measured against.

Tailpipe emissions: at their cleanest configurations the Chevrolet Silverado emits 383 g/mile of CO2 versus 392 g/mile for the GMC Sierra. Emissions track fuel consumption almost exactly, so the cleaner vehicle here is also the cheaper one to fuel.