17 MPG combined. To be clear, nobody buys a 2016 GMC Sierra C15 2WD with the 6.2L V8 expecting Prius-like efficiency. This truck’s mission is hauling, towing, and delivering serious performance, and those priorities inherently come with a trade-off at the pump. The buyer drawn to this particular Sierra configuration isn’t afraid of higher fuel costs, they’re seeking capability and a certain level of swagger that only a big V8 in a light-duty pickup can provide.

City and highway performance

The EPA estimates this Sierra at 15 MPG in the city and 21 MPG on the highway. The lower city number reflects the engine working harder during stop-and-go driving, while the higher highway figure demonstrates the benefits of the eight-speed automatic transmission, which allows the engine to cruise at lower RPMs when maintaining speed. Remember that these figures are averages, and aggressive driving or heavy loads will significantly impact fuel consumption in either scenario.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 GMC Sierra C15 2WD 6.2L at $2,600. This figure is based on driving 15,000 miles per year and using national average fuel prices. It’s a helpful benchmark, but your actual costs will vary depending on your driving habits, fuel prices in your area, and the type of fuel you use. While the Sierra does not require premium fuel, some drivers find that it delivers slightly better performance, which can impact overall fuel expenditure. For accurate figures across the entire model run, see the SIERRA MPG across all years.

Real-world expectations

While the EPA provides a standardized estimate, real-world fuel economy often differs considerably. Drivers who primarily use their Sierra for short trips around town or frequently tow heavy loads should expect to see mileage on the lower end of the EPA estimates, potentially even dipping below 15 MPG in the city. Conversely, drivers who primarily use their truck for highway cruising may find that they occasionally exceed the 21 MPG highway estimate, particularly if they drive conservatively and avoid excessive speeds. The 6.2L V8 is known for its responsiveness, and that can easily translate into enthusiastic driving that reduces fuel economy. Keep in mind cargo and trailer weights also significantly impact the miles per gallon.

How it compares

Compared to other full-size, half-ton pickups with powerful engines from 2016, the Sierra’s fuel economy is generally in line with expectations. For example, a comparable Ford F-150 with the 3.5L EcoBoost V6 was rated at 17 MPG combined, albeit with superior towing figures in some configurations. A Ram 1500 with the 5.7L Hemi V8 achieved similar fuel economy numbers, around 17 MPG combined. The trade-off for the Sierra buyer is performance and engine sound. The 6.2L V8 provides a distinct experience that separates it from the smaller turbocharged engines. If fuel efficiency is important, the Ford F-150 with the 2.7L EcoBoost V6 achieved a combined MPG of 22 during the same model year. If you want to check all Gmc fuel economy data, please visit the link.

Tips to maximize efficiency

Avoid aggressive acceleration. The 6.2L V8 is responsive, but every stab of the throttle burns fuel. Accelerate smoothly and gradually to save gas, especially in city driving. Anticipate traffic conditions and avoid hard braking, which wastes the energy momentum built up, forcing you to accelerate again to regain lost speed.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the pressure recommended on the doorjamb sticker. Be sure to consider ambient temperature when adjusting pressure, as colder temperatures can decrease tire pressure.

Minimize idling. Idling consumes fuel without moving the vehicle. If you’re going to be stopped for more than a minute, turn off the engine. Modern engines are designed to restart quickly and efficiently, so there’s no need to let them run unnecessarily. This is especially true for the Sierra, which has a larger engine that wastes fuel at idle quickly.

Reduce aerodynamic drag. Remove any unnecessary items from the bed of the truck and consider using a bed cover to improve aerodynamics. Even small changes in aerodynamic drag can impact fuel economy, especially at highway speeds. Be sure to check the front grill (if aftermarket) for any air leaks, ensuring that is closed to the front of the radiator.