15 MPG combined isn’t going to impress anyone looking for lower fuel costs, but for the 2022 GMC Sierra Cab Chassis 4WD with the 5.3L V8, it’s a recognition of its capabilities. This isn’t a grocery-getter; it’s a workhorse designed for demanding tasks, and its fuel economy reflects that. The people who buy this truck—landscapers, contractors, tradespeople— prioritize towing capacity, payload, and the ability to upfit specialized equipment far above saving on gas. For them, the V8’s power and the Sierra’s reliable chassis are essential tools of their trade.

City and highway performance

The EPA estimates for the 2022 GMC Sierra Cab Chassis 4WD with the 5.3L V8 are 13 MPG in the city and 17 MPG on the highway. These numbers reflect the reality of a heavy-duty truck battling stop-and-go traffic versus the relatively more efficient, consistent speeds achieved on the open road. The 10-speed automatic transmission optimizes the engine’s output, but the Sierra Cab Chassis is designed for strength, not aerodynamics. Expect city MPG to drop further when hauling heavy loads.

Annual fuel cost

The EPA estimates the annual fuel cost for this Sierra configuration at $2,900. This is based on driving 15,000 miles per year and using national average fuel prices. It’s a useful benchmark for comparing fuel costs across different vehicles, but remember that your actual fuel expenses may vary. Drivers who frequently tow, operate in harsh conditions, or log significantly more miles can expect to spend much more. For example, a user who drives 30,000 miles per year would likely budget closer to $5,800 for fuel.

Real-world expectations

The EPA estimates are a good guideline, but real-world mileage will vary based on driving habits, load weight, and terrain. Owners of the Sierra Cab Chassis will likely see their fuel economy fluctuate considerably. Towing heavy equipment or materials will significantly decrease MPG, sometimes into the single digits. Conversely, driving unloaded on flat, open highways might allow you to approach, or even slightly exceed, the EPA’s 17 MPG highway figure. Payload also has an impact, so always factor this in.

How it compares

Compared to other heavy-duty trucks, the Sierra Cab Chassis is in the expected range. A comparable Ford F-350 Super Duty Chassis Cab with a 6.2L V8, for instance, reports similar EPA ratings, achieving about 14 MPG combined, though official EPA data is limited for chassis cab models. The Ram 3500 Chassis Cab, depending on the engine and drivetrain configuration, also lands in a similar ballpark. For buyers needing the capability of a chassis cab, the focus shifts from fuel savings to the tradeoffs between power, durability, and upfitting options. While you can examine all all Gmc fuel economy data, if you’re seeking better fuel economy among Sierras, remember that these chassis cab models are built for a singular purpose.

Tips to maximize efficiency

While fuel economy might not be the primary concern for Sierra Cab Chassis owners, there are still strategies to minimize fuel consumption. Avoid excessive idling, as this consumes fuel at a significant rate. Instead, shut off the engine when parked or stationary for extended periods.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and burn more fuel. Check your tire pressure regularly and inflate them to the manufacturer’s recommended levels. This is true for all SIERRA MPG across all years.

Drive smoothly and avoid aggressive acceleration and braking. Gentle acceleration and gradual stops conserve momentum and reduce the demand on the engine. Anticipate traffic flows and maintain a consistent speed whenever possible.

Reduce unnecessary weight. Hauling around extra weight, whether it’s tools, materials, or equipment, directly impacts fuel economy. Remove any unnecessary items from the truck bed and cab to lighten the load.

Consider a performance tune specifically for improved fuel efficiency, so long as it does not negatively affect emissions or intended usage of the vehicle. Consult with a reputable mechanic or performance shop experienced with GMC trucks to explore this option.