23 MPG combined is a genuine achievement for the 2025 Chevrolet Suburban 2WD with its 3.0L Duramax diesel. This isn’t a compact crossover, it’s a full-size SUV designed to haul families, cargo, and trailers with ease. Buyers in this segment prioritize space and capability, and while fuel economy might not be the deciding factor, it’s certainly appreciated when it doesn’t utterly break the bank.

City and highway performance

The EPA breaks down the Suburban’s fuel economy further, revealing 21 MPG in the city and 26 MPG on the highway. The city MPG reflects the reality of navigating stop-and-go traffic with a vehicle of this size and weight. The 26 MPG highway figure is more impressive, showcasing the benefits of the diesel engine’s efficiency at steady cruising speeds, aided by the smooth-shifting 10-speed automatic transmission. This gearbox keeps the engine in its sweet spot for maximizing fuel economy at higher speeds, making long road trips surprisingly palatable.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2025 Chevrolet Suburban 2WD 3.0L at $2,400. This figure is based on driving 15,000 miles per year, with a fuel price reflecting national averages. Your personal fuel costs will vary depending on your driving habits, the type of driving you do (city vs. highway), and the fuel prices in your area. Consistent highway driving will likely yield lower annual costs, while heavy city driving and frequent towing will push that number higher. This estimated $2,400 figure provides a useful baseline for comparing running costs with other vehicles in its class.

Real-world expectations

While the EPA provides a standardized testing environment, real-world driving is rarely so consistent. Expect the advertised MPG figures to fluctuate based on several factors. Aggressive acceleration, heavy braking, increased speeds, and hauling heavy loads or trailers may reduce fuel economy. If you consistently drive aggressively, you can expect your numbers to fall below the EPA estimates. However, a patient driving style, optimized tire pressures, and diligent maintenance can help you achieve or even exceed the EPA’s numbers.

How it compares

The Suburban 2WD 3.0L’s fuel economy holds up reasonably well against its competitors, especially when considering the vehicle’s size and purpose. For example, the Ford Expedition 2WD with its 3.5L EcoBoost V6 typically sees combined MPG figures in the 17-19 range depending on the specific configuration, making the Suburban’s diesel a clear winner in fuel efficiency. Even the smaller Tahoe with the gasoline V8 struggles to match the diesel Suburban’s fuel economy, averaging around 18-20 MPG combined. These numbers are critical for Suburban buyers, many of whom rack up significant mileage with large families and frequent long journeys. View SUBURBAN MPG across all years.

Tips to maximize efficiency

Optimize your tire pressures. Ensure your tires are inflated to the pressure recommended on the doorjamb sticker. Properly inflated tires reduce rolling resistance, which directly improves fuel economy. Checking and adjusting tire pressure periodically is a simple, yet effective, way to save fuel.

Anticipate traffic flow and drive smoothly. Avoid hard acceleration and braking. Gradually accelerate and maintain a steady speed whenever possible. The Suburban’s 10-speed transmission is designed to keep the engine in its most efficient rev range, so let it do its job. A smooth driving style reduces unnecessary fuel consumption.

Minimize idling time. Modern diesel engines are relatively efficient while idling, but it still consumes fuel. If you’re stopped for more than a minute or two, consider turning off the engine. This can save fuel, especially in stop-and-go traffic.

Reduce unnecessary weight. Carrying excessive weight in your Suburban can reduce its fuel economy. Remove any unnecessary items from the vehicle, such as cargo you no longer need. The less weight the engine has to move, the better the fuel economy. Comparing all Chevrolet fuel economy data can help you understand the impact of different trim levels and options.