The 2017 BMW 340i xDrive gets 25 MPG combined. While it’s not the most fuel-efficient car, it provides an acceptable balance for those who want performance and all-weather capability in a compact luxury sedan. These drivers value a smooth inline-six engine, sharp handling, the confidence of all-wheel drive, and are willing to spend a little more on fuel.

City and highway performance

The EPA estimates the 2017 BMW 340i xDrive at 21 MPG in the city and 31 MPG on the highway. The city MPG reflects the stop-and-go driving where the car’s weight and turbocharged engine aren’t as efficient. The highway MPG, however, is more respectable because of the smooth eight-speed automatic transmission (S8) and the engine’s ability to cruise easily at higher speeds. These numbers mean that longer trips will result in better fuel economy, even if the 340i xDrive is fun to drive around town.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 BMW 340i xDrive at $2,300. This is based on driving 15,000 miles per year and using the national average fuel price, calculated by the EPA as part of its testing. Your actual fuel costs will change depending on how much you drive and where you live, as areas with higher fuel prices will increase that annual cost. This provides a point of comparison when considering other vehicles, but should be seen as a baseline.

Real-world expectations

EPA estimates are a good starting point, but fuel economy in the real world often varies. Some 340i xDrive owners report numbers close to the EPA estimates, but others find them optimistic. Factors like aggressive driving, short trips, and cold weather can negatively impact fuel economy. However, consistent highway driving at moderate speeds can lead to results exceeding the 31 MPG highway estimate. Track your fuel consumption and driving habits to understand what you can expect from this car.

How it compares

The 2017 BMW 340i xDrive is in the middle of its class for fuel economy. The Audi S4, with its 3.0-liter TFSI V6, gets about 24 MPG combined. The Mercedes-AMG C43 sedan, with similar performance, also has similar fuel consumption numbers. A less powerful, rear-wheel-drive BMW 330i achieves about 28 MPG combined, which may be attractive to buyers who don’t need all-wheel drive. The Volvo S60 T6 AWD is rated slightly higher on the highway and gets the same combined MPG. Buyers in this segment have a lot of options and are mindful of fuel costs, so these comparisons are important. Access all Bmw fuel economy data to further narrow down the best offering and even browse 340I MPG across all years.

Tips to maximize efficiency

To save fuel, select the right driving mode. “Eco Pro” mode will change the throttle response, shift points, and climate control settings to prioritize fuel savings, which is well-suited for long highway drives and city driving.

Avoid accelerating quickly and braking hard, as the 340i xDrive’s turbocharged engine achieves better fuel economy with smooth and consistent driving. Anticipating traffic flow and maintaining a steady speed will improve your MPG.

Keep your tires properly inflated and aligned. Underinflated tires increase rolling resistance, reducing fuel economy, and poor alignment can amplify the impact, so regular maintenance will keep your 340i xDrive running efficiently.

Don’t let the car idle. Modern engines still consume fuel even when stopped. If you’re stopped for more than a minute, turn off the engine. Automatic start-stop can effectively reduce city idling, even though some may find it annoying.

Remove weight from the car. Extra weight from cargo in the trunk or cabin adds to the vehicle’s overall weight and impacts fuel economy. Remove extra items to increase gas mileage.