26 MPG combined isn’t going to win any awards for fuel sippers, but for a stylish, all-wheel-drive convertible that delivers a healthy dose of driving thrills, the 2017 BMW 430i xDrive is within a reasonable range. This isn’t a car for hypermilers; it’s for those who value open-air motoring, a premium badge, and the confidence of xDrive all-wheel drive, even if it comes at a slight fuel cost.

City and highway performance

The EPA estimates for the 2017 BMW 430i xDrive Convertible equipped with the 2.0L turbocharged four-cylinder engine and eight-speed automatic transmission are 22 MPG in the city and 32 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the engine spends more time idling or accelerating from a standstill. The highway figure is more optimistic, taking advantage of the engine’s ability to cruise efficiently at steady speeds. The eight-speed automatic helps with efficiency by keeping the engine in its optimal power band. Keep in mind that aggressive driving will dramatically reduce these numbers. The 430i encourages spirited driving, but your wallet will suffer if you constantly succumb to temptation.

Annual fuel cost

The EPA estimates that the annual fuel cost for the 2017 BMW 430i xDrive Convertible will be $2,250. This figure is based on driving 15,000 miles per year and using national average fuel prices. Individual spending will depend on your driving habits and local fuel prices. To arrive at the $2,250 figure, the EPA assumes a certain percentage of city versus highway driving, as well as the national average fuel cost during the testing period. While this is a useful benchmark for comparison, always use it as a guide rather than a precise prediction of your personal fuel expenses.

Real-world expectations

While the EPA estimates provide a standardized baseline, real-world fuel economy can vary considerably. Drivers who frequently engage in short trips, drive aggressively, or live in hilly areas may find that their fuel economy falls below the EPA estimates. Conversely, those who primarily drive on the highway at moderate speeds may achieve slightly better mileage. Tire pressure and the usage of accessories like air conditioning can also affect fuel consumption. The best way to get a sense of what to expect is to research owner forums and see what other 430i xDrive Convertible drivers are reporting in similar driving conditions.

How it compares

Against its competitors, the 2017 BMW 430i xDrive Convertible’s fuel economy is competitive, but not class-leading. The Audi A5 Cabriolet with Quattro all-wheel drive, for example, achieves a similar 24 MPG combined. The Mercedes-Benz C300 Cabriolet 4MATIC manages about 25 MPG combined. These other models are direct competitors, meaning that this BMW’s buyers are cross-shopping them. The slightly lower number on the BMW isn’t a deal-breaker for them. The 430i’s buyers choose it for the driving dynamics, design, and brand appeal, considerations that often outweigh fractional differences in fuel economy. To browse all Bmw fuel economy data, check out the brand’s complete offering.

Tips to maximize efficiency

Drive smoothly and avoid aggressive acceleration and braking. The 2.0L turbocharged engine is responsive, but fuel economy suffers when you constantly demand peak performance. Anticipate traffic flow and maintain a steady speed whenever possible.

Ensure your tires are properly inflated. Low tire pressure increases rolling resistance, forcing the engine to work harder and consume more fuel. Check your tire pressure regularly, and inflate to the recommended pressure listed on the driver’s side doorjamb.

Minimize idling. If you anticipate being stopped for more than a minute or two, turn off the engine. Modern engines are designed to restart quickly and efficiently, and idling consumes fuel unnecessarily.

Use cruise control on the highway. Cruise control helps to maintain a consistent speed, reducing fuel consumption and driver fatigue. Set the cruise control at a reasonable speed, and allow the car to manage the throttle for optimal efficiency.

Consider using the ECO PRO driving mode. This mode adjusts the engine, transmission, and climate control settings to prioritize fuel efficiency. Steering feel will be reduced, but it can save a noticeable amount of fuel, especially on longer trips. You can also research 430I MPG across all years to see if newer models made improvements.