17 MPG combined. Let’s state the obvious: If you’re cross-shopping the 2021 BMW M8 Convertible with a Prius, you’ve taken a wrong turn somewhere. This isn’t a car bought for its frugality. It’s a statement, an experience, a surgically precise instrument of speed wrapped in opulent leather. The fuel economy figure is simply the price of admission into a world of breathtaking performance and open-air thrills.

City and highway performance

The EPA estimates set the M8 Convertible at 15 MPG in the city and 21 MPG on the highway. The disparity reflects the engine’s nature. Around town, the 4.4L twin-turbo V8 is rarely taxed, loafing along and still consuming fuel at a not-insignificant rate. On the open road, particularly with the automatic transmission settling into its higher gears, the M8 is surprisingly composed. While 21 MPG isn’t setting any records, it’s a pleasure for enthusiasts who also want to explore the car’s performance envelope, making long-distance cruising a less guilt-ridden experience, thanks to the engine’s efficiency technology.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2021 BMW M8 Convertible at $3,400. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving that mirrors the EPA’s testing cycle. The calculation assumes national average fuel prices. Premium fuel is required for the M8, which generally adds to the cost compared to vehicles that run on regular gasoline. To reduce costs, consider checking all Bmw fuel economy data to see if other models fit your needs.

Real-world expectations

The official EPA figures are a good starting point, but real-world fuel economy depends heavily on driving style. Owners who frequently tap into the M8’s prodigious power reserves, and let’s be honest, that’s a major draw of the car, will likely see numbers closer to the city figure, or even lower. Those who adopt a more restrained approach and prioritize highway cruising might achieve slightly better than the EPA’s estimate. Remember, the M8’s all-wheel-drive system and considerable weight also play a role. It’s definitely worth checking M8 MPG across all years for a broader view.

How it compares

The M8 Convertible occupies a unique space, but there are a few competitors worth considering. The Porsche 911 Turbo S Cabriolet, for example, delivers similar performance with slightly better fuel economy, hovering around 18 MPG combined, although the Porsche’s price tag is significantly higher.

Other ultra-performance convertibles like the Mercedes-AMG SL63 come close, offering around 16 MPG combined. These comparisons are important to the M8 buyer because, though they prioritize driving dynamics and prestige, they are not immune to considering the cost of ownership as one factor. Still, the M8 delivers on value by offering similar driving thrills at the aforementioned MPG.

Tips to maximize efficiency

Use the M8’s driving modes carefully. The “Comfort” or “Eco Pro” modes can noticeably improve fuel economy compared to the more aggressive “Sport” or “Sport+” settings. While it’s tempting to unleash the full fury of the V8 at every opportunity, resist the urge to accelerate aggressively unless genuinely necessary. Smooth and progressive acceleration is key to saving fuel.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Regularly check your tire pressures and keep them at the recommended levels to optimize efficiency.

Do not neglect regular maintenance. A well-maintained engine is an efficient engine. Ensure that your M8 receives regular servicing, including oil changes and spark plug replacements, adhering to the manufacturer’s recommendations.

Minimize aerodynamic drag by removing any unnecessary items from the car, such as roof racks or cargo carriers. When cruising on the highway, keep the windows up and the top down. These habits reduce the amount of energy required to overcome air resistance, leading to lower fuel consumption.

Plan your routes carefully to avoid stop-and-go traffic. Constant braking and acceleration consume significantly more fuel than maintaining a steady speed. Consider using navigation apps to identify routes with less congestion, allowing you to maintain a more consistent pace and improve your fuel economy.