The 2018 BMW X4 M40i 3.0L 6-cyl gets 21 MPG combined. This figure acknowledges the X4 M40i isn’t primarily about saving fuel; it’s about giving a potent mix of performance and style in a coupe-like SUV. Buyers are likely drawn to the M40i’s sporty handling, punchy engine, and unique design, and they understand that efficiency isn’t the main focus. They aren’t cross-shopping hybrids; they’re looking for a specific driving experience and look.

City and highway performance

The EPA estimates the X4 M40i gets 18 MPG in the city and 25 MPG on the highway. The frequent stops and starts of city driving, with the M40i’s eagerness to accelerate, results in the lower city figure. The highway MPG is better, and this reflects the efficiency of the eight-speed automatic transmission and the engine’s ability to cruise comfortably at higher speeds. However, even on the open road, wanting to use the engine’s power can easily lower that number. These figures reward a careful driving style, but the X4 M40i’s character encourages the opposite.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2018 BMW X4 M40i is estimated at $2,750. This calculation is based on driving 15,000 miles per year and using national average fuel prices. The actual cost will vary depending on individual driving habits and local fuel prices. Drivers who accelerate quickly or spend more time in traffic can expect to exceed this figure, while those who focus on fuel efficiency and do more highway driving may come in slightly lower. This should be seen as a way to understand the possible fuel expenses of owning this model, not a guarantee.

Real-world expectations

While the EPA estimates provide a starting point, real-world MPG for the X4 M40i often varies. Quick acceleration, frequent short trips, and even tire pressure can all affect fuel consumption. Drivers who regularly exploit the engine’s 355 horsepower will likely see numbers closer to the city estimate, even on mixed driving. If you focus on saving fuel and spend more time on the highway, you might approach the EPA’s highway figure. Monitoring your own fuel consumption and making small changes to driving habits can help you get closer to the advertised MPG.

How it compares

Compared to its competitors, the X4 M40i’s fuel economy is in the middle of the performance SUV group. For example, the Porsche Macan S offers similar performance, but averages around 19 MPG combined. The Mercedes-AMG GLC 43 Coupe also gets around 20 MPG combined. Choosing the base engine in an Audi SQ5 can yield slightly better results, around 21 MPG combined. The Acura RDX, with its less powerful engine, achieves a more respectable 23 MPG combined. For drivers considering all Bmw fuel economy data and specifically X4 MPG across all years, this comparison highlights the trade-off between performance and efficiency. The slight differences often reflect different priorities in engine tuning and vehicle weight, factors that influence both performance and fuel consumption.

Tips to maximize efficiency

Take advantage of the X4 M40i’s driving modes. Selecting “Eco Pro” mode will change the throttle response and shift points for best fuel efficiency. It might reduce the car’s eagerness a little, but it’s a way to use less gas during routine commutes. Don’t be afraid to use this mode when performance isn’t important.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which affects fuel economy. Check your tire pressure regularly, following the recommended PSI sticker on the driver’s side door jamb. Maintaining the correct pressure ensures the best efficiency and extends tire life.

Avoid unnecessary idling. Letting the engine idle for extended periods uses fuel without covering any distance. If you’re stopped for more than a minute, consider turning off the engine. Modern engines are designed to restart quickly, so there’s no need to let them run.

Minimize aggressive acceleration and braking. The X4 M40i encourages you to drive enthusiastically, but frequent hard accelerations and sudden braking reduce fuel economy. Smooth inputs will help you maintain a more consistent speed. Watch traffic and plan your movements.