24 MPG combined isn’t going to win any green awards, but for the 2025 BMW 840i xDrive Gran Coupe, equipped with its smooth 3.0L inline-six and standard all-wheel drive, it’s a figure most owners will deem perfectly acceptable. This isn’t a car bought for hypermiling; it’s a statement. It’s for the driver who prioritizes style, performance, and a certain level of driving pleasure over squeezing every last drop from the fuel tank. They want the sculpted lines, the opulent interior, and the effortless acceleration. What some might consider a compromise in economy, they see as the price of admission into a very exclusive club.

City and highway performance

The EPA numbers break down to 21 MPG in the city and 29 MPG on the highway. The city figure reflects the realities of stop-and-go traffic, where the 840i’s heft and the need to frequently accelerate from a standstill take their toll. The highway number, however, is more representative of the car’s relaxed cruising ability. The turbocharged engine delivers ample torque, allowing for effortless passing and maintaining speed on inclines. The eight-speed automatic transmission is expertly tuned to keep the engine in its sweet spot, balancing performance with respectable fuel consumption. While some might expect a more substantial gap between city and highway figures, the 840i’s relatively efficient engine design helps to minimize the drop.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2025 BMW 840i xDrive Gran Coupe is estimated at $2,400. This figure is based on driving 15,000 miles per year, with a specific percentage allocated to city and highway driving, and assumes the national average fuel price at the time of calculation. Keep in mind that this is just an estimate, and your actual fuel costs may vary depending on your driving habits, the type of fuel you use, and fluctuating gas prices. However, the $2,400 figure provides a reasonable benchmark for budgeting fuel expenses.

Real-world expectations

While the EPA provides a standardized testing environment, real-world fuel economy can differ. Aggressive driving, frequent short trips, and sustained high speeds will undoubtedly lower fuel economy below the official numbers. Conversely, consistently smooth driving and prioritizing highway miles can help achieve figures closer to, or even slightly above, the EPA estimates. The 840i’s onboard computer provides real-time and average fuel economy readouts, allowing drivers to monitor their consumption and adjust their driving habits accordingly. Be aware that premium fuel is recommended for optimal performance, which will also impact your overall running costs.

How it compares

The 840i xDrive Gran Coupe occupies a unique space. Compared to other luxury four-door coupes, its fuel economy is generally competitive. The Mercedes-Benz CLS450 4MATIC, for example, is rated at 22 MPG combined, a slight disadvantage. The Audi A7 55 TFSI quattro achieves a similar 24 MPG combined rating. Looking at other BMW models, you can compare all Bmw fuel economy data. If you’re cross-shopping with perhaps a high-performance sedan instead, a BMW M5 will offer significantly more power but at the cost of fuel consumption, often struggling to reach 20 MPG combined. See 840I MPG across all years for historical data. The buyer considering the 840i likely isn’t solely focused on fuel economy, but these comparisons provide context and help manage expectations.

Tips to maximize efficiency

Take advantage of the selectable driving modes. The “Eco Pro” mode optimizes various vehicle settings, including throttle response and transmission shift points, to prioritize fuel efficiency. While it might subtly impact performance, it can make a noticeable difference on longer journeys or in stop-and-go traffic. Don’t expect miracles, but it’s a simple way to save a bit of fuel.

Regular maintenance is essential for optimal fuel economy. Ensure your tires are properly inflated, as underinflated tires increase rolling resistance and reduce fuel efficiency. Stick to the recommended service schedule, including oil changes and air filter replacements, to keep the engine running smoothly and efficiently. A healthy engine is a fuel-efficient engine.

Avoid unnecessary idling. Modern engines are designed to be efficient, and restarting the engine consumes less fuel than prolonged idling. If you’re stopped for more than a minute, it’s generally more efficient to turn the engine off. This is especially true in urban environments where idling is common.

Anticipate traffic flow and drive smoothly. Avoid sudden acceleration and braking, as these actions waste fuel. Maintain a consistent speed whenever possible, and use cruise control on the highway to optimize fuel efficiency. Smooth, predictable driving is the key to maximizing MPG in any vehicle.

Reduce excess weight. Carrying unnecessary items in the trunk adds to the vehicle’s overall weight, which decreases fuel economy. Remove any items you don’t need to lighten the load and improve efficiency. A lighter car uses less gas.