22 MPG combined is a respectable figure for the 2024 Chevrolet Suburban 4WD with the 3.0L Duramax diesel engine. This isn’t a compact crossover; it’s a large SUV, designed to haul families, cargo, and trailers. The fact that it can achieve this level of fuel efficiency while offering such immense capability showcases the advancements in modern diesel technology. Suburban buyers aren’t primarily prioritizing fuel economy. They’re after space, towing capacity, and utility, but maximizing efficiency is always a plus.

City and highway performance

The EPA estimates for the 2024 Suburban 4WD with the diesel are 20 MPG in the city and 26 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the Suburban’s weight and size work against it.

However, the diesel’s ample torque, available low in the rev range, helps to mitigate some of the fuel penalty associated with frequent acceleration. The highway MPG is where the diesel performs well. At a steady cruising speed, the engine sips fuel, making long road trips surprisingly economical for a vehicle of this size. That 10-speed automatic transmission also plays an important role, keeping the engine in its sweet spot for both power and fuel economy. Its tall overdrive ratios are perfect for relaxed highway cruising.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2024 Chevrolet Suburban 4WD 3.0L diesel is $2,550. This calculation is based on driving 15,000 miles per year and using national average fuel prices. Obviously, your actual fuel costs will vary depending on your driving habits, local fuel prices, and how often you use the Suburban.

However, the $2,550 figure provides a standardized benchmark for comparing the Suburban’s fuel expenses to those of other vehicles.

Real-world expectations

While the EPA estimates provide a useful baseline, real-world fuel economy often differs. Factors such as driving style, terrain, and weather conditions can all influence fuel consumption. Suburban owners who frequently tow heavy loads or drive predominantly in urban environments may see lower MPG figures. Conversely, those who prioritize smooth acceleration, minimize idling, and spend more time on the open highway may achieve results closer to, or even slightly exceeding, the EPA estimates.

Properly maintaining the vehicle, including regular oil changes and tire inflation, is crucial for optimizing fuel efficiency. Don’t expect miracles, but with a conscious effort, achieving a realistic average of around 22 MPG is definitely attainable.

How it compares

The 2024 Suburban 4WD 3.0L diesel stacks up favorably against its competitors. The gasoline-powered 5.3L V8 Suburban, for example, manages only 16 MPG combined. The Ford Expedition, a direct competitor, achieves around 17 MPG combined with its EcoBoost V6. A similarly sized Toyota Sequoia with its hybrid powertrain does slightly better, landing closer to 21-22 MPG combined, a number that’s harder to replicate in real-world use cases. The diesel’s advantage becomes more apparent when towing.

The Ford Expedition sees its fuel economy plummet dramatically when hauling a trailer, while the diesel Suburban fares relatively better thanks to the engine’s superior torque delivery and lower RPM operation under load. For those who need the space and towing capacity of a large SUV, and travel long distances, the diesel Suburban is a good option. See all Chevrolet fuel economy data for a broader view.

Tips to maximize efficiency

Take advantage of the diesel engine’s low-end torque. Accelerate smoothly and avoid aggressive throttle inputs. The Suburban is not a sports car, and trying to drive it like one will only result in wasted fuel.

Use cruise control on the highway. Maintaining a consistent speed minimizes unnecessary acceleration and deceleration, which can improve fuel economy, especially on long trips where the Suburban’s aerodynamics start to impact efficiency.

Keep your tires properly inflated. Underinflated tires increase rolling resistance, which requires the engine to work harder and burn more fuel. Check your tire pressure regularly and inflate them to the recommended PSI, found on the sticker inside your driver’s side door.

Minimize idling. Idling wastes fuel and contributes to unnecessary emissions. If you’re going to be stopped for more than a minute or two, turn off the engine. This is especially crucial in urban environments when driving a vehicle the size of a Suburban.

Consider removing unnecessary weight. Do you really need to haul all of that sporting equipment or tools around all the time? Excess weight reduces fuel economy, so clear out any unnecessary items from the cargo area to lighten the load and improve MPG. Owners can also check SUBURBAN MPG across all years to see differences in MPG.