17 MPG combined won’t win any fuel-sipping awards, but for the 2021 Chevrolet Suburban 4WD with the 5.3L V8, it’s the price you pay. This isn’t a vehicle purchased for its efficiency; it’s chosen for its passenger and cargo space, its towing capability, and its ability to haul a large family and all their gear across vast distances. The fuel economy is a factor, certainly, but rarely the deciding one.

City and highway performance

The EPA estimates peg the 2021 Suburban 4WD 5.3L at 15 MPG in the city and 19 MPG on the highway. The city figure reflects stop-and-go traffic and the inefficiencies of moving a vehicle of this size from a standstill. The 19 MPG highway rating is more achievable on long, steady drives. The 10-speed automatic transmission does its best to keep the engine in its most efficient range, but ultimately, physics win. A nearly three-ton SUV pushing a wall of air will never get the mileage of a compact sedan.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Chevrolet Suburban 4WD 5.3L at $2,600. This figure is based on driving 15,000 miles per year, with 55% of those miles driven in the city and 45% on the highway, using current national average fuel prices. This is just an estimate. Your actual fuel costs will vary depending on your driving habits, the type of driving you do, and the price of gasoline in your area. Using the Suburban primarily for short trips around town will likely result in a higher annual fuel cost, while frequent highway road trips may result in a slightly lower one.

Real-world expectations

While the EPA estimates provide a baseline, real-world mileage often differs. Owners report lower figures in combined driving, especially if they frequently tow or carry heavy loads. Aggressive driving habits will also have an impact. However, drivers who prioritize smooth acceleration, anticipate traffic flow, and minimize idling can often get close to the EPA estimates, or even slightly exceed them on long highway stretches. Factors like tire pressure and ambient temperature can also affect fuel economy.

How it compares

The 2021 Suburban’s fuel economy is generally in line with other full-size, 4WD SUVs. The Ford Expedition 4×4, with its 3.5L EcoBoost V6, achieves an EPA-estimated 19 MPG combined, slightly better than the Suburban. The Nissan Armada 4WD, with its standard V8, typically returns figures closer to 16 MPG combined. For those considering GM alternatives. Understanding the SUBURBAN MPG across all years is key for optimal purchase decisions.

The Suburban is available with a 3.0L Duramax diesel engine, which offers significantly better fuel economy, typically around 22-23 MPG combined. The diesel option comes at a higher price and may not suit everyone’s needs. Shoppers who want better fuel savings should also consider the rear-wheel-drive versions of the Suburban, which offer a modest improvement in MPG.

Tips to maximize efficiency

Driving style is important. Avoid aggressive acceleration and braking. The Suburban is a large vehicle; smooth inputs are key to maximizing efficiency. Anticipate traffic flow and maintain a steady speed whenever possible. The 5.3L V8 is responsive, but it’s best to use that power wisely.

Keep your tires properly inflated. Check your tire pressure regularly and inflate them to the recommended pressure listed on the driver’s side doorjamb. Underinflated tires increase rolling resistance, which negatively affects fuel economy. Even a few PSI can make a noticeable difference.

Minimize idling. Idling consumes fuel without covering any distance. If you’re going to be stopped for more than a minute or two, turn off the engine. The Suburban’s start-stop system helps with this, but manually turning off the engine is always an option.

Reduce weight and drag. Remove any unnecessary items from the vehicle to reduce weight. A roof rack can increase aerodynamic drag, so remove it when it’s not in use. Small changes can add up.

Consider a fuel additive designed to clean fuel injectors and optimize combustion. Some additives can help to improve fuel economy, especially in older vehicles. Research different brands and choose one with a good reputation. Remember to check all Chevrolet fuel economy data which is a great resource.