25 MPG combined won’t win any fuel economy contests, but for the 2016 BMW 428i xDrive Convertible with its 2.0L turbocharged four-cylinder and all-wheel drive, it’s a reasonable compromise. This isn’t a car bought for its frugality; it’s bought for its blend of open-top driving pleasure, sharp handling, and the prestige of the BMW badge. Buyers prioritize the experience over absolute efficiency, understanding that a convertible with sporting intentions will inevitably consume more fuel than a comparable sedan.

City and highway performance

The EPA’s city rating for the 428i xDrive Convertible is 21 MPG. This isn’t surprising, as stop-and-go traffic uses more fuel in turbocharged engines due to frequent bursts of acceleration. The automatic transmission, while undoubtedly smooth and convenient, doesn’t alleviate the fuel consumption inherent in urban driving. On the highway, however, the 428i xDrive Convertible performs well, achieving 32 MPG. Here, the engine settles into a more efficient cruise, benefiting from the car’s aerodynamics (relatively speaking, for a convertible) and the long gearing of the eight-speed automatic transmission. The xDrive all-wheel-drive system adds a slight penalty to fuel economy compared to the rear-wheel-drive version, but it brings the added security of confident grip in all weather conditions.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2016 BMW 428i xDrive Convertible at $2,300. This figure is based on driving 15,000 miles per year and using national average fuel prices. Keep in mind that fuel prices fluctuate regionally and seasonally, so your actual expenses may vary, but this number provides a useful benchmark.

The xDrive all-wheel-drive system offers increased grip and control, but buyers should remember that it contributes to the annual fuel bill, so it’s important to consider if its capability is worth the increased cost to them. Comparing all Bmw fuel economy data can provide useful context.

Real-world expectations

While the EPA estimates offer a standardized comparison point, real-world fuel economy will differ. Aggressive driving, frequent short trips, and the use of premium fuel (recommended for optimal performance) can all negatively impact fuel efficiency. Similarly, factors like tire inflation and weight carried in the vehicle can make a measurable difference. However, a conscientious driver who prioritizes smooth acceleration and uses the highway frequently should be able to achieve figures close to, or even slightly above, the EPA estimates.

How it compares

The 2016 Audi A5 Cabriolet Quattro, a direct competitor, offers around 24 MPG combined with its 2.0L turbocharged engine, putting it very close to the 428i xDrive Convertible. The Mercedes-Benz C300 Cabriolet with 4MATIC posts similar numbers, hovering around 25 MPG combined. The Lexus IS 350C, another contender, offers a combined MPG in the low 20s. Fuel economy on the 428I MPG across all years 428I MPG across all years has remained fairly consistent, but technology advances and weight reduction techniques in newer models of some competitors are slowly raising the bar. The buyer considering this BMW is less concerned with squeezing every last mile out of a gallon and more concerned with finding a balance between acceptable fuel consumption and the overall driving experience.

Tips to maximize efficiency

Take it easy on the throttle. The 2.0L turbocharged engine in the 428i xDrive Convertible responds well to gentle acceleration. Avoid abrupt starts and stops, as these drastically reduce fuel efficiency. Smooth, consistent driving is the key to maximizing MPG.

Use the car’s driving modes. The 428i xDrive Convertible typically features modes such as Eco Pro, Comfort, and Sport. When fuel economy is the priority, select Eco Pro, which optimizes engine settings and throttle response for maximum efficiency. Be aware that choosing Sport will increase fuel consumption to deliver improved throttle response.

Ensure your tires are properly inflated. Check your tire pressure regularly and inflate them to the recommended level (found on a sticker inside the driver’s side doorjamb). Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Properly inflated tires also improve handling and tire longevity.

Avoid unnecessary weight. Carrying extra weight in your car reduces fuel efficiency. Remove any unnecessary items from your trunk and rear seats to lighten the load. The less the engine has to work, the better your mileage will be.

Service the car regularly. Routine maintenance, such as oil changes, air filter replacements, and spark plug replacements, ensures that your engine is running at peak efficiency. A well-maintained engine consumes less fuel and performs more reliably.