23 MPG combined is the fuel economy you can expect from the 2023 BMW X3 M40i. For a compact SUV with a reliable turbocharged inline-six producing 382 horsepower, it’s not terrible, but you should know this figure before buying. This isn’t just an economy car disguised as a sporty SUV, it’s a performance machine that values acceleration and handling more than saving gas. The typical M40i buyer probably knows this and isn’t also considering hybrid cars.

City and highway performance

The EPA estimates break down the X3 M40i’s gas mileage in different driving conditions. The 21 MPG city rating reflects frequent stops in urban areas. The M40i’s quick acceleration and immediate torque make this number lower. The 26 MPG highway rating suggests better engine efficiency when cruising, thanks to the smooth 8-speed automatic transmission. The M40i does best on longer drives, where you can enjoy its performance responsibly and benefit from consistent and efficient cruising.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 BMW X3 M40i at about $2,500, based on 15,000 miles per year and average national fuel prices. The EPA assumes 55% city and 45% highway driving. Fuel prices change, and your driving habits, such as using sport mode, will change your real-world fuel costs. If you often drive using the M40i’s fast acceleration, expect to pay more than the EPA estimate.

Real-world expectations

The EPA numbers are a baseline, but your MPG will be different. Fast driving will lower the numbers, while driving smoothly and predicting traffic will keep you closer to the official estimates. Many M40i owners live where premium fuel prices are higher than average, further increasing ownership costs. Check X3 MPG across all years to see if other model year data fits your driving style better.

How it compares

The X3 M40i’s fuel economy is in line with what you’d expect from similar vehicles. The Audi SQ5, a performance compact SUV, gets about 23 MPG combined. The Mercedes-AMG GLC 43 has similar performance, also around 22 MPG combined. The Porsche Macan S gets 22 MPG. These models are for buyers who want a strong driving experience, and their fuel consumption is part of that. If you want better gas mileage, the Lexus NX 350h hybrid gets a combined 39 MPG, but it doesn’t have the same level of performance. For a broader view, see all Bmw fuel economy data.

Tips to maximize efficiency

Pay attention to tire pressure. Properly inflated tires lower rolling resistance, improving gas mileage. Regularly check your tire pressure and inflate them to the recommended PSI on the sticker inside the driver’s side door. Even a small pressure drop can hurt MPG.

Use the “Comfort” driving mode for daily driving. While Sport mode is tempting, the Comfort setting changes throttle response and transmission mapping for efficiency. Keeping the engine in a lower RPM range in Comfort avoids the higher fuel usage of the sportier modes.

Minimize idling. Modern engines don’t need long warm-up times. Idling wastes fuel and causes emissions. Turn off the engine if you’ll wait for more than a minute or two.

Anticipate traffic flow. Fast acceleration and braking use more fuel. By looking ahead at traffic, you can keep a more consistent speed and avoid accelerating and braking hard, for better gas mileage.

Lighten the load. Extra weight makes the engine work harder. Remove unnecessary items, especially heavy ones. Reducing weight improves fuel efficiency, especially in the city.