23 MPG combined isn’t going to win any hypermiling contests, but most 2022 BMW 840i xDrive Convertible owners will shrug that off with a contented smile. This isn’t a vehicle about being frugal, it’s about experiencing wind-in-your-hair thrills, effortless power, and the luxury that only a BMW can provide. Fuel economy is a minor concern for those drawn to this blend of performance and prestige.

City and highway performance

The EPA estimates the 840i xDrive Convertible will achieve 20 MPG in the city and 27 MPG on the highway. The city figure reflects stop-and-go traffic where the 3.0L turbocharged inline-six, equipped with technologies like auto start-stop, will consume more fuel. However, the highway estimate showcases the engine’s efficiency when cruising, thanks to its smooth power delivery and the eight-speed automatic transmission’s ability to select the optimal gear for fuel conservation at higher speeds. Don’t expect to average 27 MPG while exploring the upper limits of the speedometer on the Autobahn; these are numbers achieved during controlled testing.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,500 for the 2022 BMW 840i xDrive Convertible. This calculation is based on driving 15,000 miles per year, split evenly between city and highway driving, and using the national average price of premium gasoline. Remember that this is just an estimate. Individual fuel costs will vary based on driving habits, local fuel prices, and the actual percentage of city versus highway miles driven.

Those who drive more aggressively or live in areas with higher fuel costs will almost certainly exceed the $2,500 figure. Drivers with lighter feet and highway-heavy commutes may find themselves spending less.

Real-world expectations

While the EPA figures provide a useful benchmark, real-world driving often deviates from these standardized tests. Owners of the 840i xDrive Convertible report a range of fuel economy figures, often falling somewhere between the city and highway estimates, depending on their driving style. The temptation to use the engine’s readily available power can impact fuel consumption, dropping MPG figures below the EPA’s combined rating. Mindful drivers who prioritize smooth acceleration and use the car’s driving modes can expect to more closely match, or even slightly exceed, the EPA’s projections.

How it compares

The BMW 840i xDrive Convertible exists in a competitive segment with other high-performance luxury drop-tops. Consider the Mercedes-Benz SL 55 AMG, which offers significantly more power and performance, but achieves just 16 MPG combined. The Porsche 911 Carrera Cabriolet, a perennial rival, manages a slightly better 20 MPG combined in its base form. The Lexus LC 500 Convertible lands close to the BMW at 18 MPG combined. The 840i xDrive Convertible strikes a reasonable balance in this company. For those who prioritize open-top enjoyment and effortless cruising, a few MPG difference is unlikely to be a deciding factor, particularly with 840I MPG across all years showing consistent results.

However, those seeking ultimate efficiency in a luxury vehicle might cross-shop against sedans or SUVs. You can browse all Bmw fuel economy data here.

Tips to maximize efficiency

Engage “Eco Pro” mode whenever possible. This driving mode recalibrates the throttle response, shift points, and even climate control settings to prioritize fuel conservation. While it may slightly diminish the car’s responsiveness, it can make a noticeable difference in MPG, particularly during city driving.

Avoid aggressive acceleration and braking. The turbocharged engine delivers ample torque throughout the rev range, so there’s rarely a need to accelerate hard. Smooth, gradual braking is more efficient than abrupt stops. Anticipate traffic flow to minimize unnecessary speed changes.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which directly impacts fuel economy. Check your tire pressures regularly and ensure they are inflated to the recommended levels listed on the driver’s side door jamb.

Minimize accessory use. Features like the air conditioning, heated seats, and premium audio system all draw power from the engine, which increases fuel consumption. Use these features judiciously, especially during shorter trips.

Consider the impact of the xDrive all-wheel-drive system. While it enhances traction and stability, it also adds weight and complexity, which can slightly reduce fuel economy. If you consistently drive in dry conditions, a rear-wheel-drive convertible might be a slightly more efficient option. However, the added security of xDrive is a definite advantage in inclement weather.