26 MPG combined isn’t going to win any fuel-sipping awards, but it’s a perfectly acceptable figure for the 2015 BMW 228i xDrive Convertible. This isn’t a car bought for hypermiling, it’s bought for top-down thrills combined with BMW’s signature driving dynamics and all-weather security of xDrive. Fuel economy is a consideration, sure, but not the main reason for buying it. The car appeals to those willing to trade a few MPG for the driving experience.

City and highway performance

The EPA estimates the 2015 BMW 228i xDrive Convertible at 22 MPG in the city and 32 MPG on the highway. The city figure reflects how the 2.0L turbocharged four-cylinder engine works harder to overcome inertia in stop-and-go driving. The highway number, however, better reflects its potential. With cruise control set, and the engine running quietly at lower RPMs, achieving 32 MPG is realistic. The eight-speed automatic transmission (S8) plays a significant role here, keeping the engine in its sweet spot for both performance and efficiency.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2015 BMW 228i xDrive Convertible at $2,250. This figure is based on driving 15,000 miles per year and assumes national average fuel prices. It’s a good benchmark, but your actual fuel costs will vary depending on your driving habits, the type of fuel you use (premium is recommended), and local fuel prices. If you drive fewer miles or live in an area with cheaper gas, your annual fuel expense will be lower. If you drive more miles or gas prices are higher, that will increase it. You can see all Bmw fuel economy data here.

Real-world expectations

While the EPA estimates provide a standardized basis for comparison, real-world fuel economy often differs. Many 228i xDrive Convertible owners report figures within a few MPG of the official numbers, especially on the highway. Aggressive driving, frequent short trips, and consistent use of the sport mode will decrease fuel economy. The joy of this car is its responsiveness, and enjoying that responsiveness costs more. If you’re gentle with the accelerator, you’ll get closer to the EPA estimates. Drive more aggressively, and you’ll still have fun, just at a slightly higher price per mile. You can also see 228I MPG across all years to get a better sense of variations.

How it compares

In the realm of small, sporty convertibles with all-wheel drive, the 2015 228i xDrive faces limited direct competition. The Audi A3 Cabriolet (discontinued after 2020) offered a similar experience with its available Quattro all-wheel drive. It typically delivered around 24 MPG combined with its 2.0L turbo. Other options in the broader sports car category, like a Mazda MX-5 Miata, boast significantly better fuel economy in the low 30s combined, but lack the all-weather capability and luxury features of the BMW. A Subaru BRZ or Toyota GR86 prioritizes handling and affordability, also achieving better MPG (closer to 25-27 MPG combined) but without the convertible top or xDrive. The comparison shows the 228i xDrive Convertible’s unique position: it balances performance, all-weather practicality, and open-air driving, accepting a slightly lower fuel economy in return.

Tips to maximize efficiency

Use Eco Pro mode when cruising on the highway. This mode softens throttle response and optimizes the transmission for fuel efficiency. It might dampen the spirited feeling the car is known for, but it makes a noticeable difference on long journeys and is easy to switch in and out of as needed.

Avoid unnecessary idling. The 2.0L turbo engine consumes fuel even when stationary. If you’re waiting for more than a minute or two, turn off the engine. Modern starters are designed for frequent use, and restarting is more fuel-efficient than prolonged idling.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly and inflate them to the recommended specifications, found on the sticker inside the driver’s side doorjamb. A simple adjustment can improve fuel economy.

Anticipate traffic flow and drive smoothly. Avoid sudden acceleration and braking, which waste fuel. By looking ahead and maintaining a consistent speed, you can minimize unnecessary energy expenditure. This is especially effective in city driving, where anticipating traffic lights and patterns can improve your MPG.