With 18 MPG combined, the 2025 BMW M4 CS Coupe isn’t trying to win any fuel efficiency awards. Its target demographic likely doesn’t care. This is a sharpened, track-focused car designed for carving apexes and delivering thrills. The engine’s sound and quick responses matter far more than minimizing trips to the gas station. Buyers in this segment prioritize performance over saving gas, and that’s clear in every aspect of the M4 CS.

City and highway performance

The EPA estimates the M4 CS at 16 MPG in the city and 23 MPG on the highway. The city figure reflects the demands of urban driving, plus the engine’s eagerness to rev and the driver’s urge to use the car’s power. The highway number, while better, still accounts for the aerodynamic drag and rolling resistance common in a performance coupe designed for high-speed stability. Getting 23 MPG on the highway requires restraint, something many M4 CS drivers find difficult.

Annual fuel cost

The EPA calculates the annual fuel cost for the 2025 BMW M4 CS at $3,200. This figure is based on driving 15,000 miles per year, with a 55/45 split between city and highway driving, using the current national average fuel price. This number is a benchmark for comparing all vehicles. Remember that premium fuel is required for the M4 CS’s high-performance engine, which usually costs more. Also, those 15,000 miles won’t accurately reflect this car’s use if any time is spent on track days.

Real-world expectations

Don’t expect to consistently hit those EPA numbers. Enthusiastic driving, a heavy foot, and the sound of the M4 CS’s twin-turbocharged engine will lower your MPG. Expect to see numbers closer to the combined rating or even slightly below, especially if you spend much time in city traffic or using the car’s performance on back roads. Aggressive acceleration and frequent use of Sport or Sport+ driving modes have a big effect.

How it compares

The Audi RS5 Coupe achieves a combined MPG of around 21. The Mercedes-AMG C63 S Coupe, though discontinued for 2024 with its V8, typically gets closer to 18 MPG like the M4 CS. The new C63S E Performance, with its hybrid-assisted four-cylinder, is rated at 27 MPG combined, but its driving experience is different. These comparisons are important because buyers often compare these vehicles. The M4 CS buyer accepts a small fuel economy penalty for a car that prioritizes raw performance and driver engagement. Compare these figures with M4 MPG across all years.

Tips to maximize efficiency

While fuel efficiency is unlikely a primary concern, some choices can improve your mileage.

Adopt a smoother driving style. Avoid sudden acceleration and braking, and try to maintain a steady speed on the highway. The M4 CS responds quickly to the throttle, but treating it gently will give you modest gains in fuel economy.

Ensure your tires are properly inflated. Under-inflated tires increase rolling resistance, which hurts fuel consumption. Check your tire pressure regularly, and inflate them to the levels recommended on the door jamb.

Use the Eco Pro driving mode when you can. It reduces the throttle response and optimizes the powertrain for efficiency, making cruising on the highway more economical. It’s not ideal for spirited driving, but it can save fuel in less demanding situations.

Minimize idling. If you’re stopped for more than a minute, turn off the engine. Idling consumes fuel without moving the car and contributes to lower MPG. Modern cars are designed to restart quickly, so there’s little problem with switching off the engine at long traffic lights.

Service the vehicle according to the manufacturer’s recommendations. Regular maintenance, including oil changes and air filter replacements, ensures that the engine runs best, improving fuel economy. See all Bmw fuel economy data.