25 MPG combined isn’t the main reason people buy a 2016 BMW 340i xDrive. It’s still a driver’s car, a sport sedan designed to connect the driver and the road. Fuel economy is a factor, but secondary to power, handling, and the overall BMW experience. The 340i buyer is often a professional or enthusiast who values performance and all-weather capability but wants a practical car for everyday use.

City and highway performance

The EPA estimates for the 2016 BMW 340i xDrive are 22 MPG in the city and 32 MPG on the highway. The city figure reflects stop-and-go traffic, where the engine is often idling or accelerating. The highway number reflects the 340i’s efficient cruising, in part from the smooth-shifting 8-speed automatic transmission (S8) that optimizes engine performance. Aggressive driving, a temptation with this car’s engine, will decrease both figures. For maximum fuel efficiency, consider a 328d, but expect to give up some of the 340i’s responsiveness.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 BMW 340i xDrive at $2,300. This is based on 15,000 miles per year and current national average fuel prices. Actual fuel costs depend on driving habits, local fuel prices, and the fuel grade used. The 340i doesn’t require premium fuel, but BMW recommends it for optimal performance, which increases the annual cost. This should be considered in the overall cost of ownership.

Real-world expectations

The EPA provides a standard, but real-world fuel economy often varies. Driving style, traffic, terrain, and tire pressure can all affect MPG. Owners who prioritize performance and frequently use the engine’s power will likely see figures closer to the low end of the EPA range, or even lower. But those who drive more conservatively and spend time cruising on the highway may achieve numbers closer to, or even slightly exceeding, the EPA estimates. Checking 340I MPG across all years reveals how ratings can change over time.

How it compares

The 2016 BMW 340i xDrive is in a competitive class. The Audi S4, with its supercharged V6 and quattro all-wheel drive, performs similarly but often gets slightly lower fuel economy, around 24 MPG combined. The Mercedes-Benz C450 AMG (later C43 AMG) offers similar power and all-wheel drive, also around 24 MPG combined. The Lexus IS 350 AWD, known for its reliability, sacrifices some performance for about 22 MPG combined. These small differences can add up and influence a buyer’s decision, especially when considering other ownership costs. If fuel efficiency is a key concern, the non-xDrive 340i version may offer slightly better fuel economy due to its lighter weight and reduced drivetrain losses. See all Bmw fuel economy data.

Tips to maximize efficiency

Gentle acceleration makes a difference. The 340i’s turbocharged engine responds quickly, but using the throttle too much wastes fuel. Accelerate smoothly and gradually to minimize fuel use, especially in city driving.

Use the 340i’s Eco Pro mode. This adjusts the throttle, shift points, and climate control to prioritize fuel efficiency. It affects performance, but can improve MPG during everyday driving.

Keep tires properly inflated. Underinflated tires increase rolling resistance, which reduces fuel economy. Check tire pressure regularly and inflate tires to the recommended pressure on the sticker inside the driver’s side doorjamb.

Reduce unnecessary weight. Extra weight in the trunk or passenger area increases fuel use. Remove any unnecessary items. The less weight, the more efficient it will be.

Avoid idling. Don’t idle for too long, especially when the engine is warm. Modern engines warm up quickly while driving, and idling wastes fuel and produces emissions. If you expect to be stopped for more than a minute or two, turn off the engine.