19 MPG combined isn’t going to win any awards, but the 2015 BMW 650i xDrive Convertible isn’t about sipping fuel. It’s about luxurious open-air motoring paired with a potent V8 and all-weather capability, and the buyer understands this trade-off. This car prioritizes driving pleasure and exclusivity over outright efficiency, and those drawn to its blend of performance and style accept the fuel economy as part of the package.

City and highway performance

The EPA estimates put the 650i xDrive Convertible at 16 MPG in the city and 24 MPG on the highway. The city number reflects the demands placed on the 4.4-liter V8 during stop-and-go traffic, its inherent thirst amplified by the car’s substantial curb weight. The highway figure, while better, still isn’t class-leading. It speaks to the engine’s effortless power delivery at cruising speeds, but also the aerodynamic challenges of a convertible configuration. The S8 automatic transmission, despite its efficiency-enhancing gear ratios, can only do so much to mitigate the fundamental fuel consumption of a powerful, naturally aspirated engine powering a heavy vehicle. The xDrive all-wheel-drive system, while beneficial for traction and stability, adds weight and complexity, further impacting fuel economy.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2015 BMW 650i xDrive Convertible is $3,050. This calculation is based on driving 15,000 miles per year and using the national average fuel prices. It’s a substantial figure, placing this vehicle firmly in the territory of those less concerned with budget-friendly motoring. The higher annual fuel cost underscores the reality of owning a performance-oriented luxury convertible with all-wheel drive. It highlights that while the upfront cost of the car may be a known quantity, the ongoing expenses, particularly fuel, should be factored into the ownership equation.

Real-world expectations

While the EPA estimates provide a benchmark, real-world fuel economy often varies. Aggressive driving, frequent short trips, and prolonged idling will all push the MPG figures below the official ratings. Conversely, careful driving on open highways might yield slightly better results. However, it’s unlikely that owners will consistently achieve significantly higher fuel economy than the EPA estimates. The temptation to exploit the engine’s power and the pleasure of open-top cruising often outweighs the desire for optimal fuel efficiency. Drivers can explore 650I MPG across all years to get a better sense of how these estimates have evolved.

How it compares

Compared to its competitors, the 650i xDrive Convertible’s fuel economy is generally in line with other high-performance luxury convertibles. For example, a 2015 Mercedes-Benz SL550, with its 4.7-liter V8, achieves around 17 MPG city and 25 MPG highway. An Audi RS 5 Cabriolet, with its smaller, high-revving V8, manages around 16 MPG city and 23 MPG highway. These marginal differences aren’t usually the deciding factor for buyers in this segment. The buyer looking at all Bmw fuel economy data will realize that fuel efficiency is generally not a priority with these high-performance models.

Tips to maximize efficiency

While the 650i xDrive Convertible isn’t known for its fuel efficiency, there are steps owners can take to minimize fuel consumption. Regular maintenance, including properly inflated tires and timely oil changes, can optimize engine performance and reduce rolling resistance.

Avoid aggressive acceleration and hard braking. Smooth, deliberate driving allows the engine and transmission to operate more efficiently, minimizing fuel wasted during sudden bursts of power or abrupt stops. Use the car’s driving modes, selecting “Eco Pro” when appropriate, to prioritize fuel efficiency over performance. This mode adjusts throttle response and shift patterns to reduce fuel consumption.

Minimize idling. Letting the engine run while stationary consumes fuel unnecessarily. In situations where you anticipate being stopped for an extended period, turn off the engine to conserve fuel. Consider removing any unnecessary weight from the vehicle. Excess cargo adds to the car’s overall weight, increasing the engine’s workload and negatively impacting fuel economy.

Plan your routes to avoid congested areas and traffic jams. Stop-and-go traffic significantly reduces fuel efficiency. Choosing less congested routes, even if they are slightly longer, can result in better overall fuel economy.