25 MPG combined in the 2018 BMW X5 xDrive 35d isn’t going to win any green awards, but it represents a solid compromise for buyers needing the space and capability of a mid-size luxury SUV without completely sacrificing fuel efficiency. It’s not a Prius, it’s a refined German vehicle with a powerful diesel engine, built for comfortable long-distance cruising and occasional off-road adventures. Its owners prioritize a premium driving experience over hyper-miling bragging rights.

City and highway performance

The EPA estimates of 23 MPG in the city and 29 MPG on the highway showcase the benefits of the X5 35d’s diesel engine. The relatively small difference between city and highway fuel economy suggests the engine maintains a high level of efficiency in varied driving conditions. The highway figure is particularly appealing to those who frequently embark on road trips, offering a respectable range between fill-ups. This efficiency allows for confident overtaking maneuvers and relaxed high-speed cruising, hallmarks of the BMW driving experience.

Annual fuel cost

According to the EPA, the estimated annual fuel cost for the 2018 BMW X5 xDrive 35d is $2,250. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that actual fuel costs can vary depending on driving habits, local fuel prices, and the specific blend of diesel fuel available in your region.

Real-world expectations

Official EPA figures provide a useful benchmark, but real-world mileage can vary. Expect a slight dip in fuel economy if you frequently engage in aggressive driving, tow heavy loads, or consistently operate the vehicle with a full complement of passengers and cargo. Factors like tire pressure, ambient temperature, and the use of accessories like air conditioning can also impact overall efficiency. However, with sensible driving habits, achieving numbers close to the EPA estimates is entirely reasonable. This X5 diesel’s smooth power delivery allows for relaxed progress that helps preserve fuel.

How it compares

The 2018 BMW X5 xDrive 35d holds its own against some competitors, while naturally falling short of thriftier offerings. A gasoline-powered X5 xDrive35i from the same year, for example, typically sees combined figures closer to 20–21 MPG. A comparable Mercedes-Benz GLE350 might achieve around 22 MPG combined, highlighting the diesel’s advantage in fuel economy. Of course, smaller and less powerful SUVs like the Lexus RX 350 achieve 23 MPG combined, but lack the X5’s outright towing capacity and spacious feel. Buyers choose the X5 35d specifically for its blend of diesel torque, load carrying, and relative efficiency compared to similar sized SUVs.

For all Bmw fuel economy data, there is a large spread depending on the exact engine configuration of a vehicle.

Check out X5 MPG across all years for more historical trends of this model.

Tips to maximize efficiency

Take advantage of the X5 35d’s “Eco Pro” driving mode. This setting adjusts various vehicle parameters, such as throttle response and shift points, to prioritize fuel efficiency. Activate it during highway cruising or when navigating stop-and-go traffic to help the transmission and engine management software lean out its operating parameters.

Regularly check and maintain proper tire pressure. Underinflated tires increase rolling resistance, which can significantly reduce fuel economy. Consult the sticker on your driver’s side doorjamb for the recommended tire pressure for your specific X5 model.

Avoid unnecessary idling. If you anticipate stopping for more than a minute or two, turn off the engine. Modern vehicles, including the X5, are designed to restart quickly and efficiently, minimizing the impact on fuel consumption.

Minimize aerodynamic drag by removing roof-mounted cargo carriers or accessories when not in use. These items increase wind resistance, forcing the engine to work harder and consume more fuel. Similarly, avoid driving with the windows open at high speeds.

Plan your routes strategically to avoid congestion and minimize stop-and-go driving. Using navigation apps that provide real-time traffic updates can help you identify and bypass congested areas, resulting in smoother and more fuel-efficient journeys. Smoothly accelerating and avoiding excessive braking can also boost mileage.