23 MPG combined won’t win any fuel efficiency awards, but the BMW X4 M40i isn’t designed for economy. It’s a performance-oriented crossover coupe, and that MPG figure reflects the tradeoffs made to deliver an exciting driving experience. This isn’t a vehicle bought by those prioritizing maximum efficiency; it’s for drivers who want a stylish, fun-to-drive machine and are willing to pay more at the pump for that experience.

City and highway performance

The X4 M40i sees predictable fluctuations between city and highway driving. Expect around 21 MPG in the city. Stop-and-go traffic, combined with the engine’s eagerness to respond to throttle inputs, contributes to the lower number.

Out on the open road, the X4 M40i fares better, achieving around 26 MPG. The overdrive gears in the eight-speed automatic work to their advantage here, allowing the engine to cruise at lower RPMs. However, aggressive driving or consistently high speeds will quickly diminish those highway MPG gains. Remember that the available power is always tempting, and the more you tap into it, the more fuel you burn.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 BMW X4 M40i at $2,500, based on driving 15,000 miles per year and using national average fuel prices. This figure assumes a relatively even split between city and highway driving. Individual fuel costs will vary depending on your driving habits, local fuel prices, and the type of fuel used. Keep in mind that the X4 M40i recommends premium fuel, which carries a higher cost per gallon than regular gasoline.

Real-world expectations

Official EPA estimates are a useful baseline, but real-world mileage often deviates. X4 M40i owners frequently report figures close to the official numbers, but these are heavily dependent on driving style. Those who accelerate quickly and brake hard will likely see numbers closer to 19-20 MPG, while more conservative drivers can potentially achieve figures closer to 24-25 MPG in mixed driving. The X4 M40i’s sporty nature encourages more aggressive driving, which will inevitably reduce fuel economy. This is not the car for hypermiling; its appeal lies in the immediate power and responsiveness that come at a cost.

How it compares

In the realm of sporty crossover coupes, the BMW X4 M40i’s fuel economy is fairly typical. The Mercedes-AMG GLC 43 Coupe, a direct competitor, gets around 21 MPG combined. The Porsche Macan S, another performance-oriented option, achieves roughly 19 MPG combined.

Comparing the X4 M40i with more mainstream SUVs reveals a clear difference. A Lexus RX 350, which prioritizes comfort and efficiency, manages around 25 MPG combined. Even within the BMW lineup, you’ll find that the X3 xDrive30i, with its less powerful engine, delivers several more MPG than the M40i.

These comparisons highlight the tradeoff: the X4 M40i offers a significantly more engaging driving experience than those alternatives, but sacrifices fuel economy in the process. For additional BMW insight, be sure to check out all Bmw fuel economy data, or dive straight into X4 MPG across all years.

Tips to maximize efficiency

Use “Comfort” or “Eco Pro” driving modes whenever possible. The X4 M40i offers multiple driving modes that adjust engine and transmission settings. Selecting a less aggressive mode softens throttle response and encourages earlier upshifts, resulting in improved fuel economy. Save “Sport” and “Sport+” modes for when you truly want to enjoy the car’s performance capabilities.

Avoid unnecessary idling. The X4 M40i’s engine consumes fuel even when stationary. Idling for extended periods, such as in a drive-thru or waiting for someone, significantly reduces overall fuel economy. Turn off the engine if you anticipate being stopped for more than a minute.

Maintain proper tire pressure. Underinflated tires increase rolling resistance, forcing the engine to work harder and thus using more fuel. Check your tire pressure regularly and inflate them to the recommended level, which can be found on a sticker inside the driver’s side doorjamb.

Anticipate traffic and drive smoothly. Abrupt acceleration and hard braking waste fuel. By anticipating traffic flow and maintaining a consistent speed, you can reduce fuel consumption. Smooth driving also enhances passenger comfort and reduces wear and tear on the vehicle.