25 MPG combined isn’t going to win any hypermiling awards, but it’s a perfectly reasonable figure for the 2021 BMW 840i Coupe. This isn’t a car designed for maximizing fuel efficiency; it’s a stylish grand tourer built for effortless cross-country drives and occasional spirited backroad blasts. Buyers drawn to the 840i aren’t prioritizing fuel economy above all else. They want a luxurious, comfortable, head-turning coupe with a powerful engine, and they understand that comes with a trade-off at the pump.

City and highway performance

The EPA estimates the 840i Coupe at 23 MPG in the city and 30 MPG on the highway. The city figure reflects stop-and-go traffic, where the engine’s start/stop system will kick in to save fuel at red lights. The highway number is more impressive. The smooth-revving inline-six and the eight-speed automatic transmission’s ability to cruise comfortably in the higher gears contribute to this achievement. The 840i’s long-legged nature shines on the open road, making those long drives the car was designed for less painful on your wallet.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2021 BMW 840i Coupe at $2,300. This figure is based on driving 15,000 miles per year and using the national average fuel price. Keep in mind that this is just an estimate; your actual fuel cost will vary depending on your driving habits, the type of fuel you use, and the prevailing gas prices in your area. Drivers with a heavy foot, or those who primarily drive in congested city environments, can expect to exceed that $2,300 figure. However, those that mostly cruise on the open road might come under it.

Real-world expectations

EPA estimates provide a good baseline, and real-world fuel economy can often differ. The 840i Coupe’s turbocharged engine with variable valve timing and driver-selectable modes allow for some control over fuel consumption. Eco Pro mode prioritizes efficiency, softening throttle response and encouraging earlier upshifts. Comfort mode strikes a balance between performance and economy, while Sport and Sport+ modes prioritize performance, which inevitably means reduced MPG. Drivers who frequently use these sportier modes should expect to see lower fuel economy numbers than the EPA estimates. The 840i rewards spirited driving, but that comes at the expense of fuel efficiency.

How it compares

Compared to its competitors, the 840i’s fuel economy is competitive within its class. The Mercedes-Benz C300 Coupe, a smaller but still stylish option, achieves a slightly better 28 MPG combined, while the quicker AMG C43 drops to 22 MPG combined. Moving up in size, the Lexus LC 500 manages just 19 MPG combined from its V8 engine. Some might also cross-shop with the Porsche 911, whose Carrera trim achieves 21 MPG combined. These comparisons highlight that buyers in this segment are typically willing to trade some fuel efficiency for performance, luxury, or a unique driving experience. Looking at 840I MPG across all years shows how the range has stayed relatively consistent.

Tips to maximize efficiency

Use the 840i’s Eco Pro mode, especially during commutes or when cruising on the highway. This mode optimizes the engine and transmission settings for maximum fuel efficiency. While it may dull the throttle response, it can make a noticeable difference over longer distances and is a good option when you’re not in a hurry and want to conserve fuel.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which forces the engine to work harder and consumes more fuel. Check your tire pressures regularly and inflate them to the recommended levels listed on the driver’s side doorjamb.

Avoid aggressive acceleration and braking. Smooth and steady driving habits can significantly improve fuel economy. Anticipate traffic flow and avoid sudden changes in speed. The 840i’s reliable brakes are very capable, but using them less frequently will help conserve momentum.

Minimize idling. If you’re stopped for more than a minute or two, turn off the engine. Modern engines are designed to restart quickly and efficiently, and idling wastes fuel. The 840i’s automatic start/stop system helps with this in city driving, but you can consciously avoid prolonged idling situations.

Consider using cruise control on the highway. Cruise control helps maintain a consistent speed, which can improve fuel economy on long drives. However, be mindful of hilly terrain, as the cruise control may downshift aggressively to maintain speed, negating some of the fuel-saving benefits. Be aware of all Bmw fuel economy data to make your own judgements.