25 MPG combined is a reasonable fuel economy figure for the 2020 BMW M340i, especially when considering the vehicle’s purpose. This isn’t a hybrid designed for maximum efficiency; it’s a performance-oriented sedan that prioritizes driving pleasure. The M340i attracts buyers who demand sporty handling, brisk acceleration, and a touch of luxury, accepting a moderate fuel bill as the price.

City and highway performance

The EPA estimates the M340i gets 22 MPG in the city and 30 MPG on the highway. The city figure reflects the stop-and-go driving conditions where the engine spends more time idling or accelerating from a standstill, situations that naturally reduce fuel economy. The highway number, however, is quite respectable, as the M340i settles into a relaxed cruise, efficiently using its 3.0L inline-six engine. A significant contributor to highway efficiency is the eight-speed automatic transmission (S8), which allows the engine to operate at lower RPMs, reducing fuel consumption when you are cruising.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2020 BMW M340i is $2,300. This estimate is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that this is just an estimate; your actual fuel costs may vary depending on your driving habits, the type of fuel you use, and local fuel prices. If you drive significantly more or less than 15,000 miles a year, simply adjust the estimate to reflect your own mileage. For those who consistently enjoy the M340i’s performance capabilities, expect that annual figure to climb.

Real-world expectations

While the EPA estimates provide a useful benchmark, real-world fuel economy can differ. The M340i is equipped with a potent engine that encourages spirited driving, and frequent use of its performance capabilities will certainly impact fuel consumption. Drivers who spend most of their time in heavy traffic or prioritize rapid acceleration will likely see figures lower than the EPA estimates. Conversely, those who stick to a conservative driving style and primarily drive on the highway have a good chance of meeting or slightly exceeding the official numbers. Check M340I MPG across all years for a broader picture of owner-reported fuel economy.

How it compares

The 2020 BMW M340i competes with other performance sedans like the Audi S4, Mercedes-AMG C43, and Genesis G70 3.3T. The Audi S4, with its 3.0L turbocharged V6, achieves an EPA-estimated 24 MPG combined. The Mercedes-AMG C43, also featuring a 3.0L turbocharged V6, is rated at 22 MPG combined. The Genesis G70 3.3T offers 20 MPG combined. This indicates that the M340i sits near the top of its competitive set in fuel efficiency. Those considering cross-shopping a true luxury car with a performance bent will want to consult all Bmw fuel economy data for more context.

Tips to maximize efficiency

The M340i responds well to a smooth and controlled driving style. Avoid aggressive acceleration and hard braking, as these actions consume more fuel. Anticipating traffic flow and maintaining a consistent speed can significantly improve your fuel economy.

The M340i features selectable driving modes that can influence fuel efficiency. The “Eco Pro” mode, if equipped, prioritizes fuel conservation by adjusting throttle response, shift points, and climate control settings. Using this mode during less demanding driving situations can help to maximize MPG.

Proper tire inflation is important for optimal fuel economy and your safety. Check your tire pressure regularly, using the recommended settings found on the driver’s side doorjamb or in the owner’s manual. Underinflated tires increase rolling resistance, leading to reduced fuel efficiency.

Keep up with the M340i’s scheduled maintenance. Regular oil changes, air filter replacements, and spark plug maintenance will keep the engine running smoothly and efficiently, preventing performance degradation and maintaining optimal fuel economy. Sticking to BMW’s recommended service intervals is essential.

Reduce unnecessary weight in the vehicle. Carrying extra weight in the trunk or passenger area increases the amount of energy required to accelerate and maintain speed, negatively impacting fuel economy. Remove any items you don’t need to lighten the load.