18 MPG combined might raise eyebrows, but not for the typical buyer of a 2017 BMW 650i xDrive Convertible. This isn’t just transportation, it’s a statement about effortless performance, a luxurious open-air experience, and the prestige associated with a flagship BMW convertible. Fuel economy, while not irrelevant, plays a supporting role to the performance and style.

City and highway performance

The EPA estimates the 2017 BMW 650i xDrive Convertible at 15 MPG in the city and 24 MPG on the highway. The city figure reflects stop-and-go driving, where the strong 4.4L twin-turbo V8 works harder and the all-wheel-drive system contributes to increased drag. The highway number is more reasonable, showcasing the engine’s ability to cruise efficiently at higher speeds, thanks to the eight-speed automatic transmission that optimizes fuel consumption when the power isn’t needed for overtaking. However, lead-footed drivers will see those highway numbers plummet quickly, the temptation to exploit the V8’s performance is ever-present.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,200 for this vehicle. This figure is based on driving 15,000 miles per year, with an assumed fuel price that reflects the national average. Your actual fuel cost will vary depending on your driving habits, the type of fuel you use (premium is recommended for optimal performance), and local fuel prices. Someone who primarily drives in the city and accelerates frequently will likely exceed this estimate considerably, while someone who uses this 650i mainly for comfortable, longer weekend trips with the top down might get closer to that $3,200 mark.

Real-world expectations

Real-world fuel economy in a 2017 BMW 650i xDrive Convertible is heavily dependent on driving style. If you regularly explore the upper reaches of the tachometer, expect to see numbers closer to 12-13 MPG in mixed driving. On the other hand, a more restrained driving style, focusing on smooth acceleration and maintaining consistent speeds, can yield figures closer to the EPA estimates. This car is not designed for hypermiling, it’s designed for grand touring with the occasional thrill ride. If you’re obsessive about fuel consumption, you’re buying the wrong car.

How it compares

The 650i xDrive Convertible’s fuel economy is in line with expectations for a high-performance luxury convertible. The Mercedes-Benz SL550, with its 4.7L V8, delivers similar figures, hovering around 17 MPG combined. A Porsche 911 Carrera S Cabriolet might offer slightly better fuel economy (around 20-21 MPG combined), due to its lighter weight and more advanced engine technology, but it sacrifices some of the 650i’s grand touring comfort. Within the BMW lineup, the smaller four-cylinder 430i Convertible achieves considerably superior fuel economy (around 28 MPG combined), but it delivers a vastly different driving experience. Buyers cross-shopping these vehicles aren’t primarily focused on saving money at the pump, they’re weighing performance, luxury, and brand prestige.

Tips to maximize efficiency

There are steps you can take to minimize fuel consumption. Avoid aggressive acceleration and hard braking. The 4.4L V8 responds beautifully to a gentle throttle, and using the engine’s abundant torque rather than its peak horsepower will improve your MPG.

Use the Driving Dynamics Control system. Switching to “Eco Pro” mode alters the throttle response and shift points to prioritize fuel efficiency. While it may slightly dampen the car’s responsiveness, it can make a noticeable difference on longer drives. Plus, you can always switch back to “Sport” or “Sport+” when the mood strikes.

Ensure your tires are properly inflated and maintain your vehicle according to the manufacturer’s recommendations. Underinflated tires increase rolling resistance, reducing fuel economy. Regular maintenance, including oil changes and air filter replacements, ensures the engine operates at peak efficiency.

Minimize idling. Modern engines are designed to run efficiently at low speeds, but prolonged idling wastes fuel, especially with the 650i’s large displacement V8 engine. If you’re stopped for more than a minute, it’s generally more fuel-efficient to turn off the engine.

Reduce unnecessary weight. Carrying extra cargo in the trunk increases fuel consumption, especially in the city. Remove any items you don’t need to lighten the load and improve your MPG. Extra weight in the trunk also negatively impacts handling and performance.

The 2017 BMW 650i xDrive Convertible is about open-air thrills supported by all Bmw fuel economy data for this brand, not squeezing every last mile from a gallon of premium fuel. Those who choose this BMW are willing to pay the price for automotive enjoyment. Explore 650I MPG across all years to understand the historical context of this model.