20 MPG combined isn’t going to win any hypermiling awards, but for the 2018 BMW X5 xDrive35i, it’s a figure that many owners deem acceptable in exchange for the vehicle’s capabilities and driving experience. This isn’t a machine designed primarily for saving fuel; it’s a mid-size luxury SUV built to deliver a blend of performance, comfort, and all-weather confidence. Understanding this context is key to appreciating where the X5 sits relative to its rivals.

City and highway performance

Looking more closely at the EPA estimates, the 2018 X5 xDrive35i returns 18 MPG in the city and 24 MPG on the highway. The city figure reflects the stop-and-go conditions typical of urban driving, where the X5’s weight and the frequent acceleration from a standstill affect fuel economy. The highway figure, meanwhile, is more respectable. The smooth-shifting 8-speed automatic transmission and the inherent efficiency of BMW’s turbocharged 3.0L inline-six engine at steady cruising speeds contribute to this efficiency. This highway number makes long road trips a more appealing prospect, especially for families who frequently use the X5 for such journeys.

Annual fuel cost

The EPA estimates an annual fuel cost of $2,900 for the 2018 BMW X5 xDrive35i. This figure is based on driving 15,000 miles per year and assumes current national average fuel prices for premium unleaded gasoline, which is typically recommended for optimal performance in this engine. Remember that this is an estimate. Your actual fuel costs will vary depending on driving habits, local fuel prices, and the percentage of city versus highway miles you drive. For example, someone who drives primarily in congested city conditions will likely exceed this estimate, while someone who primarily uses the X5 for highway cruising might see a lower annual cost.

Real-world expectations

Official EPA figures provide a useful baseline, but what about real-world experiences? Many owners find that achieving the stated 20 MPG combined is possible with a light foot and a mix of driving conditions. However, aggressive driving, frequent short trips, and prolonged idling can easily lower the average. Factors like tire pressure, vehicle maintenance, and even the use of accessories like roof racks can impact fuel consumption. It’s critical to maintain the vehicle properly and adopt mindful driving habits to get the most out of each gallon.

How it compares

The 2018 X5 xDrive35i exists in a competitive segment. The Acura MDX SH-AWD, for example, boasts a slightly better combined MPG of 22. The Lexus RX 350 also edges ahead with 23 MPG combined. On the other hand, the Mercedes-Benz GLE 350 4MATIC from the same year is closer to the X5, with a combined rating of 20 MPG. These differences in MPG matter to buyers conscious of fuel costs over the lifespan of the vehicle. The X5’s driving dynamics and brand cachet remain strong selling points which can outweigh a slight disadvantage in fuel economy for many.

Tips to maximize efficiency

Use the X5’s Eco Pro mode. Activating this mode alters the throttle response and shift patterns to prioritize fuel efficiency. While it might slightly dull the driving experience, it can lead to noticeable savings, especially during everyday commuting.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressures regularly and inflate them to the levels recommended on the driver’s side doorjamb.

Minimize unnecessary weight and aerodynamic drag. Remove any items you don’t need from the vehicle, as extra weight reduces fuel efficiency. Avoid using roof racks or cargo carriers unless absolutely necessary, as they significantly increase aerodynamic drag.

Drive smoothly and avoid aggressive acceleration and braking. Rapid acceleration and hard braking waste fuel. Anticipate traffic flow and maintain a consistent speed whenever possible. Gradual acceleration and smooth braking can significantly improve your MPG.

Consider having the vehicle’s computer updated to the latest software version. Sometimes, manufacturers will update the engine and transmission control software which can improve fuel economy. X5 MPG across all years is easily comparable when factory software updates are applied. Check with your local BMW service center for any relevant updates for your specific vehicle.

The 2018 BMW X5 xDrive35i isn’t a fuel sipper, nor is it intended to be. It’s a luxury SUV made for buyers who prioritize a blend of performance, luxury, and capability, accepting a moderate compromise in fuel economy as part of the equation. All BMW fuel economy data reflects these typical compromises in each vehicle.