25 MPG combined. That’s what you can expect if you’re considering a 2020 BMW M340i xDrive. Before you get too concerned, understand what this car is: a seriously fast, all-weather sports sedan that also works as a practical family car. This isn’t about hyper-miling; it’s about balance. The M340i xDrive attracts buyers who prioritize performance and handling, and still need sedan practicality. They’re willing to trade some fuel efficiency for acceleration and the confidence of all-wheel drive. They know that, despite the badge, it’s not a hybrid.

City and highway performance

Breaking down that 25 MPG combined, the M340i xDrive achieves an EPA-estimated 22 MPG in the city and a more palatable 30 MPG on the highway. The city figure reflects the stop-start nature of urban driving, where the engine is constantly working against stoplights and traffic. The on-ramp blast up to highway speeds doesn’t help, either. The 30 MPG highway figure better reflects steady-state cruising, where the turbocharged 3.0-liter inline-six can perform relatively well. Consider that those highway numbers probably reflect a driver who is aggressively passing other cars at 75-80 mph, not carefully drafting behind semis. The eight-speed automatic transmission (S8) is programmed for quick shifts when you’re pushing it, and more relaxed, fuel-conscious gear changes when simply cruising.

Annual fuel cost

The EPA estimates that you’ll spend $2,300 per year fueling your 2020 BMW M340i xDrive. This figure is based on driving 15,000 miles per year and using national average fuel prices. This is a good starting point for budgeting, but remember that real-world fuel costs can vary significantly based on your driving habits, the type of fuel you use (premium is recommended, though not necessarily required), and where you live. States with higher fuel taxes will see this number climb quickly.

Real-world expectations

The EPA estimates require a disciplined right foot and gentle acceleration to achieve. Most M340i xDrive owners aren’t buying the car for that type of driving. More realistic expectations are in the low 20s for combined MPG, especially if your daily commute involves heavy traffic or if you regularly use the car’s performance. A heavy foot will quickly cause your MPG to drop. Highway runs, driven with restraint, should yield numbers in the high 20s.

How it compares

The M340i xDrive sits in a competitive segment. Consider the Audi S4. Its turbocharged V6 and standard all-wheel drive provide similar performance to the M340i. The S4 typically achieves around 24 MPG combined. The Mercedes-AMG C43 sedan, another direct competitor, delivers similar thrills with an MPG figure in the same ballpark. The Genesis G70 3.3T with optional all-wheel drive offers comparable performance at a lower price point, but its fuel economy generally lags behind the German rivals, closer to 20 MPG combined. For buyers primarily concerned with efficiency, a Lexus IS 350 F Sport offers sporty looks with RWD, but is less performance-oriented and yields roughly 23 MPG combined. These comparisons help solidify why M340I MPG across all years represents a reasonable trade-off for the performance it delivers.

Tips to maximize efficiency

Use the Driving Modes effectively. The M340i xDrive offers various driving modes, including Eco Pro, Comfort, and Sport. Eco Pro mode prioritizes fuel efficiency by adjusting throttle response, transmission mapping, and even climate control settings. Use it during normal commutes and save Sport mode for when you want to enjoy the car’s full potential. Comfort mode is a good middle ground for everyday driving.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check your tire pressure regularly and inflate them to the recommended levels, found on a sticker inside the driver’s side doorjamb. Also, don’t fit overly wide or aggressive tires that will create undue rolling resistance. Consider a dedicated set of winter tires during colder months, which can improve traction without sacrificing fuel economy as much as all-season tires in snow.

Anticipate traffic flow. This might seem obvious, but it’s crucial for maximizing fuel efficiency. Avoid unnecessary acceleration and braking by anticipating traffic lights and maintaining a consistent speed. Look ahead, and if you see traffic slowing down, lift off the throttle early rather than slamming on the brakes at the last minute.

Minimize idling. Idling wastes fuel. If you’re stopped for more than a minute, turn off the engine. The M340i xDrive has a start-stop system that automatically shuts off the engine at stoplights to conserve fuel. But be aware that extremely short trips with start-stop activated will have the engine turning on and off repeatedly, somewhat offsetting the efficiency gains.

Keep up with maintenance. A properly maintained engine is a more efficient engine. Follow the recommended maintenance schedule for your M340i xDrive, including regular oil changes, air filter replacements, and spark plug replacements. A neglected engine will produce less power and consume more fuel. For owners interested in all Bmw fuel economy data, this is a basic step in good ownership.