17 MPG combined. The 2023 BMW M8 Competition Convertible isn’t winning any fuel efficiency awards, nor is it trying to. This is a brutally fast, exquisitely crafted performance machine designed for open-air thrills, not maximizing trips to the gas station. If lower fuel costs are your primary concern, you’re shopping in the wrong universe entirely. For those who prioritize blistering acceleration and a symphony of V8 sound, the M8’s fuel consumption is simply the cost of admission.

City and highway performance

The EPA estimates the M8 Competition Convertible at 15 MPG in the city and 22 MPG on the highway. The city figure reflects the engine’s thirst during stop-and-go traffic, where frequent bursts of acceleration quickly deplete the fuel tank. The highway number is more respectable, but achieving it requires resisting the urge to constantly exploit the engine’s immense power. A careful right foot and steady cruising speeds are key, but restraint isn’t exactly in the M8’s DNA.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 BMW M8 Competition Convertible at $3,400. This is based on driving 15,000 miles per year and using national average fuel prices. Remember that your actual fuel costs may vary significantly depending on your driving habits, location, and fluctuating gas prices. This figure serves as a benchmark, highlighting the premium associated with owning and operating a high-performance vehicle with a powerful V8 engine. It’s also a critical factor for owners to consider when budgeting for the M8’s upkeep, as other costs like insurance and maintenance will already be at the higher end of the spectrum.

Real-world expectations

While the EPA estimates offer some guidance, real-world fuel economy for the M8 Competition Convertible tends to be even lower, especially if you frequently engage its performance capabilities. Owners report that the advertised 15 MPG in the city is challenging to achieve, with some experiencing figures closer to 12-13 MPG during spirited driving. On the highway, it’s possible to reach the 22 MPG estimate with a relaxed driving style, but expect to see those numbers drop significantly when indulging in passing maneuvers or higher speeds. If you’re constantly using launch control, prepare for your fuel gauge to plummet. The M8 encourages, even demands, that you use its power, and that will inevitably impact fuel consumption.

How it compares

The M8 Competition Convertible competes with other high-performance convertibles and grand tourers. The Porsche 911 Turbo S Cabriolet, for example, offers a slightly better EPA-estimated combined MPG of 17 MPG (equivalent to the M8), but delivers similar levels of performance and luxury with a different, more focused driving dynamic. The Mercedes-AMG SL63, another potent competitor, achieves around 16 MPG combined. These comparisons highlight that while efficiency isn’t a primary focus for this class, some competitors offer marginal improvements. Those fractional differences hold little sway for the M8 buyer, who prioritizes the BMW’s specific blend of luxury, technology, and over-the-top power. They seek out this body style, interior, and brand image, and they understand it comes with the territory on the fuel front. You can find all Bmw fuel economy data on this site.

Tips to maximize efficiency

Adopt smoother acceleration and braking techniques. The M8’s strong engine responds well to gentle inputs, and avoiding sudden bursts of speed can significantly improve fuel economy, especially in city driving. Anticipate traffic flow and avoid unnecessary braking maneuvers. A smoother, more predictable driving style will conserve fuel and reduce wear and tear on your brakes.

Use the M8’s driving modes. The “Comfort” mode optimizes the car for efficiency, softening throttle response and adjusting shift points to prioritize fuel economy. While it won’t transform the M8 into a hybrid, it can help squeeze out a few extra miles per gallon during everyday driving. However, for the true M8 experience, you’ll likely be in Sport or Sport+ mode most of the time.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the manufacturer’s recommended levels. This is especially critical during temperature fluctuations, as tire pressure can vary significantly.

Minimize idling. When stopped for extended periods, such as at traffic lights or while waiting to pick someone up, turn off the engine. Idling consumes fuel without moving the vehicle, and can quickly add up. Modern vehicles restart quickly and efficiently, making this a simple and effective way to save fuel.

Regularly service your M8. A well-maintained engine operates more efficiently. Adhere to BMW’s recommended service intervals for oil changes, spark plug replacements, and other essential maintenance tasks. A healthy engine burns fuel more cleanly and efficiently. For more information, check out M8 MPG across all years.