23 MPG combined. That’s the number many potential BMW X4 M40i buyers might gloss over, or perhaps even ignore entirely. This isn’t a Prius, or even a standard X4; it’s a performance-oriented coupe-SUV hybrid, aimed at drivers who value agility and a potent powertrain over lower fuel costs. The priority is the snarl of the inline-six and the sure-footedness of the xDrive all-wheel-drive system, not hypermiling techniques.

City and highway performance

The X4 M40i’s EPA ratings break down to 21 MPG in the city and 27 MPG on the highway. The city figure reflects the reality of stop-and-go traffic, where the 3.0-liter engine’s turbocharger is constantly spooling up and down. The highway number is more palatable, a result of consistent speeds and the engine settling into a more efficient cruise. However, even on the open road, a heavy right foot will quickly diminish any attempts at maximizing fuel economy. The eight-speed automatic transmission (S8) contributes to overall efficiency with its ability to select the optimal gear for the driving situation.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2021 BMW X4 M40i is $2,500. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that premium fuel is required to unlock the engine’s maximum performance and efficiency, so those fuel costs could vary a great deal depending on where you live and how you drive. A driver who covers more miles, engages in more aggressive acceleration, or lives in an area with higher fuel prices will inevitably see a higher annual fuel expenditure.

Real-world expectations

While the EPA estimates provide a baseline, real-world fuel economy for the X4 M40i often varies depending on driving style and conditions. Those who primarily drive in urban environments can expect figures closer to, or even slightly below, the 21 MPG city rating. Conversely, drivers who frequently embark on long highway journeys, maintaining a steady speed, may see numbers exceeding 27 MPG. The overall average hovers around the combined 23 MPG mark if you drive with any sort of gusto. This is because the turbo six is simply too eager to please, urging you to put your foot down at every onramp and exit.

How it compares

The X4 M40i exists in a competitive space, battling other performance-oriented SUVs and coupe-SUVs. The Acura MDX, for example, manages around 22 MPG combined using its V6 and SH-AWD system. A Mercedes-AMG GLC 43 Coupe, while similarly powerful, offers slightly worse efficiency around 21 MPG combined. A Porsche Macan S, known for its performance credentials, shows an identical 23 MPG combined rating. Buyers cross-shopping these models will need to weigh performance, luxury, and fuel economy to determine which vehicle best suits their needs. Owners can review X4 MPG across all years to get a sense of how fuel economy may change with different model years and engines. You can also review all Bmw fuel economy data as well at FuelEconomyHub.com.

Tips to maximize efficiency

While the X4 M40i prioritizes performance, there are several strategies drivers can use to improve fuel economy. Avoiding rapid acceleration and hard braking can make a significant difference, as these actions demand more fuel to deliver peak power. Gentle and linear throttle inputs allow the engine to operate more efficiently, particularly in urban driving conditions.

Using the X4 M40i’s various driving modes can also help optimize fuel economy. Selecting “Eco Pro” mode alters throttle response and transmission behavior to prioritize efficiency. This can be especially useful on long highway trips where performance demands are lower. Experiment with the different drive modes and learn how they affect fuel consumption.

Regular maintenance is critical for maintaining optimal fuel efficiency. Ensure the tires are properly inflated to the recommended pressure, as underinflated tires increase rolling resistance. Keep up with scheduled oil changes and air filter replacements, as these components affect engine performance and fuel consumption. A well-maintained engine operates more efficiently, resulting in better gas mileage.

Minimize aerodynamic drag by removing unnecessary items from the roof rack and avoiding excessive speeds on the highway. Roof racks and high speeds create increased drag, requiring more fuel to maintain momentum. Small adjustments to driving habits and vehicle configuration can add up to noticeable improvements in fuel economy over time. If you really want better fuel economy, take off your roof rack when not in use.