23 MPG combined is a surprisingly respectable number for the 2021 GMC Yukon XL 2WD with the 3.0L Duramax diesel. This SUV is not a Prius. It’s a massive, body-on-frame SUV designed to haul families and tow boats. Yukon XL buyers aren’t solely prioritizing fuel efficiency, but the diesel’s relative thriftiness is a welcome bonus, allowing them to cover longer distances without frequently stopping for fuel.

City and highway performance

The EPA’s 2021 GMC Yukon XL 2WD 3.0L 6-cyl fuel economy estimates break down to 21 MPG in the city and 27 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the Yukon XL’s weight and size impact mileage. However, the smooth-shifting 10-speed automatic transmission and the diesel’s ample low-end torque help to mitigate some of the fuel penalty. On the open road, the 27 MPG highway rating is where this powertrain performs best. The diesel settles into a relaxed cruise, making long road trips significantly more economical than the gasoline V8 alternatives.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 GMC Yukon XL 2WD 3.0L diesel at $2,400. This is based on driving 15,000 miles per year and using national average fuel prices. Individual fuel costs will vary depending on driving habits and local fuel prices, but this provides a standardized benchmark for comparing fuel expenses across different vehicles. Drivers who frequently tow or spend more time in heavy traffic will likely see a higher annual fuel cost.

Real-world expectations

The EPA estimates provide a useful starting point, but real-world fuel economy can vary depending on driving conditions and habits. Owners report that achieving the EPA’s 27 MPG highway figure is possible on long trips at steady speeds. However, towing, carrying heavy loads, aggressive acceleration, and idling in traffic can all decrease fuel economy. Do not expect to consistently match the EPA estimates if your driving style is aggressive. The 3.0L diesel performs best when driven with a gentle foot. Consistent, predictable driving will get the most out of the Duramax’s efficiency. Remember to check YUKON MPG across all years and trims, as different configurations will yield different results.

How it compares

The 2021 GMC Yukon XL 2WD diesel is a unique option in the world of large SUVs. The gasoline-powered 2021 Yukon XL with the 5.3L V8 is rated at 17 MPG combined. A similarly equipped Ford Expedition Max, with its EcoBoost V6, manages around 19 MPG combined. The Chevrolet Tahoe, mechanically similar to the Yukon XL, offers near-identical fuel economy figures. The diesel’s superior fuel economy is an advantage for those who prioritize long-distance comfort and reduced fuel stops. Those cross-shopping should also compare all Gmc fuel economy data for the model year.

Tips to maximize efficiency

Regular maintenance is critical for optimal fuel economy. Ensure that the tires are properly inflated to the recommended pressure, as underinflated tires increase rolling resistance and reduce efficiency. A well-maintained engine also runs more efficiently, so keep up with scheduled oil changes and other maintenance tasks.

Avoid aggressive acceleration and hard braking. The Duramax diesel delivers strong torque at low RPMs, so there is no need to floor the accelerator. Gentle acceleration and smooth braking will conserve fuel and reduce wear and tear on the vehicle. Anticipating traffic flow and maintaining a steady speed also contributes to better fuel economy.

Minimize idling time. Excessive idling wastes fuel and contributes to emissions. If you anticipate stopping for more than a minute or two, it’s generally more economical to turn off the engine. The Yukon XL’s diesel engine can restart quickly and easily, so there’s little penalty for turning it off during brief stops.

Plan your trips strategically. Combining multiple errands into a single trip reduces the number of cold starts, which are less fuel-efficient than driving with a warmed-up engine. Avoiding peak traffic times can also improve fuel economy by reducing idling and stop-and-go driving.