18 MPG combined is something to consider for anyone thinking about the 2021 GMC Yukon 4WD with its 5.3L V8 engine. Potential owners must acknowledge this upfront. This isn’t a fuel-sipping crossover; it’s a full-size SUV built for hauling families, gear, and even trailers confidently. Buyers in this segment typically prioritize capability and space over efficiency, and they understand the trade-offs.

City and highway performance

The EPA estimates the 2021 GMC Yukon 4WD 5.3L at 16 MPG in the city and 20 MPG on the highway. The city figure, reflecting stop-and-go traffic, is where many drivers will feel it most. The Yukon’s weight and its engine’s displacement work against it in these conditions. On the open road, the 10-speed automatic transmission helps keep the engine in its most efficient range, contributing to the slightly better 20 MPG highway rating. However, maintaining that highway figure requires a conscious effort to drive smoothly and avoid excessive speed.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 GMC Yukon 4WD 5.3L at $2,450. This is based on driving 15,000 miles per year and using national average fuel prices. Individual costs will vary based on local fuel prices and driving habits, so consider your typical usage. While $2,450 represents the EPA’s calculated annual fuel cost, aggressive driving or frequent short trips will likely result in a higher real-world expense.

Real-world expectations

Do not expect to consistently achieve the EPA’s combined 18 MPG in everyday driving. Real-world conditions, including traffic, terrain, and driving style, significantly impact fuel economy. Owners who frequently tow or carry heavy loads will experience a notable drop in MPG. City driving is particularly detrimental, and even on the highway, exceeding the speed limit can quickly negate any potential fuel savings. A more realistic expectation for mixed driving is a range of 15-19 MPG. It’s essential to track fuel consumption to get an accurate picture of your vehicle’s efficiency.

How it compares

Compared to its rivals, the 2021 GMC Yukon 4WD 5.3L’s fuel economy is generally similar to other full-size, V8-powered SUVs. The Ford Expedition 4×4 with its 3.5L EcoBoost V6 is rated at 19 MPG combined, a slightly more efficient alternative if you want a different engine. The Chevrolet Tahoe 4WD, mechanically similar to the Yukon, shares its 18 MPG combined rating. A Toyota Sequoia 4WD, with its older powertrain, achieves a less impressive 14 MPG combined. For buyers who desire better fuel economy in the segment, they should consider the diesel variants that can reach around 24 MPG on the highway. People who shop for the Yukon accept the fuel economy trade-off for performance, space, and overall utility.

Tips to maximize efficiency

Gentle acceleration and braking can significantly improve fuel economy. Avoid aggressive driving habits, which require the engine to work harder and consume more fuel. Anticipate traffic flow and coast whenever possible, allowing the vehicle to maintain momentum without using excessive throttle.

Ensure that your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and reducing fuel efficiency. Check tire pressure regularly, especially during temperature changes, which can affect inflation levels.

Minimize idling time. If you’re stopped for more than a minute, turn off the engine. Excessive idling burns fuel without contributing to forward motion. Modern vehicles start quickly and efficiently, so restarting the engine consumes less fuel than letting it idle.

Use cruise control on the highway to maintain a consistent speed. Cruise control helps prevent unintentional acceleration, which can waste fuel. Set the cruise control to a reasonable speed and avoid frequent adjustments to maximize efficiency.

Consider having aftermarket active fuel management installed to force the truck into 4-cylinder mode more easily. Many Yukon drivers find themselves driving around in V8 mode even when not towing or hauling anything, which is very inefficient.