25 MPG combined isn’t the primary reason most people buy the 2017 BMW 340i. This sport sedan is for drivers who prioritize performance and driving dynamics. Fuel economy matters, but it’s balanced against the thrill of a turbocharged 3.0L inline-six engine that delivers smooth power and satisfying acceleration. The 340i buyer wants a practical daily driver that can also handle corners and provide an engaging experience, and they’re willing to accept average fuel consumption to get that.

City and highway performance

The EPA estimates for the 2017 BMW 340i with the 3.0L 6-cylinder and automatic (S8) transmission are 21 MPG in the city and 32 MPG on the highway. The city figure reflects stop-and-go driving, where the 340i’s responsive throttle can tempt drivers into enjoying quick bursts of acceleration. The highway MPG is respectable, allowing for comfortable and relatively economical long-distance cruising, because of the smooth and efficient nature of a modern turbocharged engine.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2017 BMW 340i at $2,300. This figure assumes 15,000 miles of driving per year and uses the national average fuel price at the time of calculation. Individual fuel costs will vary based on driving habits, local fuel prices, and the ratio of city to highway miles driven. A driver primarily commuting in heavy city traffic will likely exceed this estimate. Buyers can explore 340I MPG across all years to consider the impact of different model years and powertrain configurations.

Real-world expectations

EPA estimates provide a baseline, but real-world fuel economy can vary. A driver who often uses the 340i’s performance potential will likely see figures lower than the EPA estimates. But a driver who prioritizes fuel efficiency and uses features like Eco Pro mode may achieve numbers closer to or even exceeding the official ratings, particularly on longer highway journeys. The 340i’s responsiveness encourages spirited driving, so discipline is required to maximize efficiency.

How it compares

The 2017 BMW 340i’s fuel economy sits in a particular spot in the sport sedan segment. A comparable Audi S4, with its supercharged 3.0L V6, had an EPA rating of 24 MPG combined, making it slightly less efficient on paper. A Mercedes-AMG C43, another competitor, was rated at 20 MPG city and 27 MPG highway, making it noticeably less fuel efficient in both driving situations. The Lexus IS 350, while offering a naturally aspirated V6, achieved around 22 MPG combined, making it less efficient compared to the 340i. Buyers who are considering other options can also explore all Bmw fuel economy data.

Tips to maximize efficiency

Use Eco Pro mode whenever possible, particularly during commutes or extended highway driving. This mode adjusts throttle response and shift patterns to prioritize fuel efficiency without completely sacrificing performance. While the 340i is quick, resist the urge to constantly accelerate aggressively. Smooth and consistent driving will yield significant improvements in fuel economy.

Make sure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, which negatively impacts fuel efficiency. Check your tire pressure regularly, especially during changes in temperature.

Reduce unnecessary weight in the vehicle. Removing extra cargo from the trunk and back seats reduces the load on the engine, improving fuel economy. Every extra pound requires more energy to accelerate and maintain speed.

Consider using cruise control on the highway. Maintaining a consistent speed helps prevent unnecessary acceleration and deceleration, optimizing fuel consumption. Use the adaptive cruise control feature, if equipped, to maintain a safe following distance while maximizing efficiency.

Regular maintenance is important to optimizing fuel economy. Make sure your engine is properly tuned, and that the air filter is clean. A well-maintained engine operates more efficiently and consumes less fuel. A clogged air filter will reduce airflow to the engine, forcing it to work harder and using more fuel to create the same power.