21 MPG combined for the 2021 Land Rover Discovery MHEV with the 3.0L inline-six isn’t going to win any hypermiling contests, but let’s be honest, no one buying this vehicle is expecting Prius-like efficiency. This is a practical and capable luxury SUV designed for hauling families and gear in comfort, both on and off the paved road. Fuel economy is a consideration, sure, but it’s far from the primary driver in a Discovery purchase. The target audience prioritizes space, brand cachet, and go-anywhere capability more than squeezing every last mile from a gallon of premium fuel.

City and highway performance

The disparity between the city and highway ratings paints a clear picture of where this Discovery’s fuel consumption suffers most. The EPA estimates 18 MPG in the city and 24 MPG on the highway. Stop-and-go traffic, coupled with the vehicle’s weight and permanent four-wheel-drive system, take a toll on efficiency in urban environments. Open-road cruising, however, allows the mild-hybrid system to contribute more effectively, recuperating energy during deceleration and providing electric boost to the engine when accelerating. Consequently, the Discovery MHEV fares noticeably better on longer highway journeys at steady speeds.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 Land Rover Discovery MHEV at $2,750. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. Of course, your actual fuel expenses will vary depending on your driving habits, the proportion of city versus highway driving you do, and the prevailing fuel prices in your area. With premium fuel typically required, that $2,750 can easily climb higher if fuel prices spike in your local market. So it is an important data point to consider how you use your vehicle when analyzing the long run true cost to own.

Real-world expectations

While the EPA figures provide a useful baseline, real-world fuel economy often differs. A heavy right foot or frequent off-road excursions will undoubtedly push the MPG below the official ratings. Conversely, a careful driver who primarily sticks to highways might see slightly better numbers. Expect something in the range of 19-23 MPG in mixed driving conditions. The mild-hybrid system contributes to some improvement, but it’s not a game-changer. This technology is more about smoothing out power delivery and reducing strain on the engine than dramatically increasing fuel economy. Also consider that vehicle load will decrease the fuel numbers on the Discovery, so when passengers and gear are added make sure to buffer your performance expectations accordingly.

How it compares

Compared to its rivals, the 2021 Land Rover Discovery MHEV’s fuel economy is neither exceptionally good nor alarmingly bad. The BMW X5 xDrive40i, with its inline-six, achieves around 23 MPG combined, slightly better than the Discovery. Meanwhile, the Mercedes-Benz GLE 450 4MATIC, another competitor with a mild-hybrid inline-six, also posts similar numbers in the low- to mid-20s for combined MPG. The Volvo XC90 B6 offers similar power, but with a smaller, turbocharged and supercharged four-cylinder engine. This option typically delivers slightly better economy around 24 MPG combined. These comparisons matter for buyers balancing luxury, performance, and practicality. Those prioritizing fuel efficiency above all else might find the Volvo more appealing, while those who value off-road tradition and brand image might find the Discovery remains in strong consideration despite a small MPG penalty. Before making any decision make sure to check all Land fuel economy data.

Tips to maximize efficiency

Use the Discovery’s Eco drive mode. This setting adjusts throttle response and transmission mapping to prioritize fuel efficiency over outright performance. It won’t turn the Discovery into a fuel sipper, but it can contribute to incremental gains over time.

Maintain a steady speed whenever possible because you’re trying to avoid constantly accelerating and decelerating. The mild-hybrid system works best when the vehicle is cruising at a consistent speed, allowing the engine to operate more efficiently and helping the electric motor contribute.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which forces the engine to work harder and consumes more fuel. Refer to the door jamb sticker for the recommended tire pressure.

Minimize excessive idling. Turn off the engine if you’re stopped for more than a minute or two. Modern engines are designed to restart quickly and efficiently, and idling wastes fuel unnecessarily.

Reduce unnecessary weight. Carrying heavy items in the cargo area or on the roof rack will decrease fuel economy. Remove any unnecessary items to improve efficiency and consider the impacts of this weight on the ROVER MPG across all years.