While the 2022 BMW M340i’s 26 MPG combined isn’t its biggest draw, this performance sedan prioritizes smooth, responsive power and precise handling. Fuel economy is a secondary, but necessary, consideration, so this Bimmer balances thrills and practicality.

City and highway performance

The M340i gets an EPA-estimated 23 MPG in the city and 32 MPG on the highway. The city number reflects stop-and-go conditions where the engine works harder, and the automatic transmission (S8) shifts more frequently. The B58 engine’s responsiveness is readily apparent in city driving, even if it means using a bit more gas. The highway number shows the engine’s efficiency at consistent speeds where it can cruise easily and use its aerodynamic design. This highway efficiency makes the M340i a viable daily driver, even for those who drive a lot. Drivers who are frequently on the open road will see their average MPG get closer to that 32 MPG mark.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2022 BMW M340i at $2,250. This is based on driving 15,000 miles per year and using national average fuel prices. Premium fuel is recommended for the M340i because it has a high-performance engine, and that will affect the total cost. These costs will vary based on personal driving habits, location, and current fuel prices. Aggressive driving, prolonged idling, and colder weather can all decrease fuel efficiency and increase the amount spent on fuel annually.

Real-world expectations

The EPA provides a standard number, but real-world fuel economy will vary depending on driving style, traffic, and roads traveled. Someone who drives aggressively or spends a lot of time in stop-and-go traffic may see numbers closer to 20 MPG combined. A driver who spends most of their time on the highway and drives efficiently could exceed the EPA’s 32 MPG rating. Expect the numbers to change.

M340i owners usually know this and accept the trade-off for the car’s performance.

How it compares

The M340i’s fuel economy is competitive in its class. The Audi S4, with its 3.0-liter V6, gets a similar 24 MPG combined. The Mercedes-AMG C43 Sedan, with a turbocharged engine, also gets around 22 MPG combined. The Genesis G70 3.3T gets around 20 MPG city and 28 MPG highway. These comparisons are important because buyers often compare these models, considering performance, fuel efficiency, and luxury features. The M340i offers a thrilling driving experience and reasonable fuel consumption.

You can explore all Bmw fuel economy data on this site, as well as drill in to M340I MPG across all years to track trends.

Tips to maximize efficiency

Avoid aggressive acceleration and braking. The M340i’s responsive throttle encourages spirited driving, but gentle inputs help conserve fuel. Anticipate traffic flow and maintain a steady speed whenever possible.

Make sure your tires are properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and inflate them to the recommended levels specified on the door jamb sticker.

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate being stopped for more than a minute, turn off the engine. The M340i’s automatic start/stop system helps with this, but you can proactively shut off the engine in situations where the system doesn’t engage.

Use cruise control on the highway to maintain a consistent speed, which helps fuel economy. Be mindful and adjust the settings to account for changing traffic conditions.

Keep up with regular maintenance for a more efficient engine. Follow the manufacturer’s recommended maintenance schedule, including oil changes, air filter replacements, and spark plug replacements. This helps ensure your M340i is operating at peak performance and efficiency.