22 MPG combined for the 2023 Chevrolet Suburban 4WD with the 3.0L Duramax diesel isn’t exactly Prius territory, but it’s a surprisingly respectable figure since this vehicle is a body-on-frame behemoth capable of hauling eight passengers and towing a small house. It’s not a grocery-getter for urban dwellers, it’s a tool for families who need space, capability, and the confidence to tackle nearly any driving condition.

City and highway performance

The EPA estimates rate the Suburban 4WD diesel at 20 MPG in the city and 26 MPG on the highway. That highway number is particularly impressive, and it reflects the engine’s relaxed cruising nature and the 10-speed automatic transmission’s ability to keep the engine in its sweet spot. Around town, the Suburban’s size and weight will have more of an impact, but even 20 MPG is a strong showing for a vehicle of this class. Much of this is thanks to the diesel’s abundant low-end torque, which means less throttle input is required to get the Suburban moving. This relaxed attitude from the engine delivers fuel savings that would be impossible with a larger gasoline V8.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2023 Chevrolet Suburban 4WD 3.0L diesel will be $2,550. This is based on driving 15,000 miles per year and using national average fuel prices. While individual costs may vary based on driving habits and local fuel prices, this figure provides a valuable benchmark for understanding the Suburban’s fuel consumption in relation to other vehicles and the SUBURBAN MPG across all years.

Real-world expectations

Keep in mind that the EPA estimates are just that, estimates. Factors like driving style, terrain, tire pressure, and the amount of weight you’re carrying or towing will all influence real-world fuel economy. Suburban owners who frequently tow heavy loads or spend a lot of time in stop-and-go traffic will likely see lower numbers than the EPA estimates. But for those who primarily use the Suburban for highway driving and prioritize fuel efficiency, achieving or even exceeding the EPA highway figure is certainly possible.

How it compares

Compared to its direct competitors, the Suburban 4WD diesel holds its own remarkably well. The gasoline-powered 2023 Ford Expedition 4×4, for example, achieves an EPA-estimated 19 MPG combined. The Toyota Sequoia, completely redesigned for 2023 and only available as a hybrid, manages a combined 20 MPG in 4WD form. These figures make the Suburban’s diesel powertrain particularly attractive.

Even within the Chevrolet family, comparing the Suburban 4WD diesel to a Suburban 4WD with the 5.3L V8 (16 MPG combined) highlights the diesel’s fuel-saving advantages. For buyers prioritizing fuel economy without sacrificing the Suburban’s inherent capabilities, the diesel is the clear choice. Don’t forget to check all Chevrolet fuel economy data for more comparison options.

Tips to maximize efficiency

One of the simplest ways to save fuel in the Suburban is to drive smoothly. Avoid sudden acceleration and braking, and anticipate traffic flow to maintain a steady speed. The diesel engine’s generous torque allows for relaxed driving, so use it.

Tire pressure plays a significant role in fuel economy. Check your tires regularly and ensure they are inflated to the recommended pressure listed on the door jamb. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel.

Minimize unnecessary weight. The less you’re carrying in the Suburban, the less energy it takes to move it. Remove any cargo you don’t need, and avoid carrying heavy items on the roof rack unless absolutely necessary. Aerodynamic drag also increases with added roof-mounted equipment, negatively influencing fuel economy.

Plan your trips strategically. Combine errands into a single trip to reduce cold starts, which are less fuel-efficient. Also, consider using navigation apps to find the most efficient routes, avoiding congested areas whenever possible.

Finally, keep up with routine maintenance. Properly maintained vehicles run more efficiently. Ensure your engine is properly tuned, and that your filters are clean. Regular oil changes, using the correct oil viscosity, contribute to maximizing fuel economy.