26 MPG combined is a perfectly acceptable figure for the 2023 BMW M340i xDrive, and one that rarely deters its target buyer. This is a compact sport sedan with serious performance, not a dedicated fuel sipper like a Prius. Its potent 3.0L turbocharged inline-six engine delivers exhilarating acceleration and a thrilling driving experience, so the fuel economy is understood to be a trade-off. The M340i xDrive caters to enthusiasts who prioritize driving pleasure and performance over absolute efficiency, and for them, 26 MPG is a reasonable compromise.

City and highway performance

The EPA estimates for the 2023 M340i xDrive break down to 23 MPG in the city and 32 MPG on the highway. The city figure reflects the demands of stop-and-go traffic, where the engine works harder and spends more time at idle. The highway number, however, showcases the efficiency of the turbocharged six-cylinder when cruising at a consistent speed. 32 MPG is achievable on longer road trips, making the M340i xDrive a surprisingly capable long-distance tourer. The smooth-shifting eight-speed automatic transmission (S8) undoubtedly plays a crucial role in optimizing fuel efficiency at higher speeds, keeping the engine in its sweet spot for power delivery and economy.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 BMW M340i xDrive driver at $2,250. This figure is based on driving 15,000 miles per year and using national average fuel prices. Individual fuel costs can vary depending on driving habits, fuel prices in your area, and the type of fuel used (premium fuel is recommended for optimal performance). It’s important to remember that aggressive driving will significantly increase fuel consumption and push that annual cost higher.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy can vary depending on driving style, traffic conditions, and terrain. Drivers who frequently exploit the M340i’s performance capabilities will likely see numbers below the EPA estimates. However, those who prioritize smooth acceleration, anticipate traffic, and maximize highway cruising can potentially achieve figures closer to, or even slightly exceeding, the EPA’s 32 MPG highway rating. Regular maintenance, including proper tire inflation and timely oil changes, also contributes to maintaining optimal fuel efficiency.

How it compares

Compared to its rivals, the 2023 M340i xDrive occupies a middle ground in terms of fuel economy. The Audi S4, another performance-oriented sedan with all-wheel drive, achieves a similar combined rating of 24 MPG. The Mercedes-Benz C43 AMG, with its turbocharged four-cylinder, delivers slightly better fuel economy at 28 MPG combined, though some argue it sacrifices some of the M340i’s character and sound. The Genesis G70 3.3T with all-wheel drive also trails slightly, typically landing around 20 MPG combined. These distinctions matter to buyers cross-shopping these models, but ultimate driving experience often outweighs a few MPG difference. View all Bmw fuel economy data.

Tips to maximize efficiency

Using the M340i xDrive’s Eco Pro driving mode can make a tangible difference in fuel consumption, especially in urban environments. This mode optimizes engine parameters and transmission shift points for maximum efficiency, reducing throttle response and encouraging earlier upshifts. While it may dampen the car’s sporty character, it’s a valuable tool for minimizing fuel usage during daily commutes.

Gentle acceleration and smooth braking are key to maximizing fuel economy in any vehicle, and the M340i xDrive is no exception. Avoid aggressive starts and hard stops, as these actions waste fuel and put unnecessary strain on the engine and brakes. Anticipating traffic flow and maintaining a consistent speed will contribute to a significant improvement in overall fuel efficiency.

Regularly check and maintain the correct tire pressure because underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Refer to the sticker on the driver’s side doorjamb for the recommended tire pressure. Proper tire inflation also improves handling and extends tire life.

Minimize the use of accessories that place a heavy load on the engine, such as air conditioning, especially during short trips. Reducing air conditioning usage, even by a small amount, can improve fuel economy. Consider lowering the windows when appropriate to reduce load placed on the engine.

Regular maintenance, including timely oil changes, air filter replacements, and spark plug inspections, ensures the engine is running optimally and efficiently. See M340I MPG across all years. Adhering to the manufacturer’s recommended maintenance schedule prolongs the life of the engine and helps it achieve its best possible fuel economy.