23 MPG combined isn’t going to win the 2016 BMW 435i Convertible any fuel-sipping awards, but that figure is almost beside the point. The 435i Convertible isn’t about practicality, it’s about open-air motoring, a potent turbocharged inline-six engine, and iconic BMW styling. Buyers drawn to this car prioritize driving enjoyment and image far more than squeezing every last mile from a gallon of premium fuel.

City and highway performance

The EPA estimates the 435i Convertible will achieve 20 MPG in the city and 30 MPG on the highway. The city figure reflects the stop-and-go nature of urban driving, where the car’s weight and the engine’s eagerness to deliver power contribute to decreased efficiency. The highway number, on the other hand, is more respectable. With the eight-speed automatic transmission in its higher gears and the engine running at low RPM, 30 MPG is achievable on long road trips, even if those trips are often punctuated by spirited bursts of acceleration to pass slower traffic. This split in performance highlights why potential owners should consider their typical driving environment before getting hung up on the combined MPG figure.

Do you expect to spend most of your time crawling bumper-to-bumper, or do you look forward to weekend getaways on winding coastal roads? The answer will dictate how relevant the EPA’s numbers are to your specific experience.

Annual fuel cost

According to the EPA, the annual fuel cost for the 2016 BMW 435i Convertible is approximately $2,500. This estimate is based on driving 15,000 miles per year and using national average fuel prices. Of course, this number will vary significantly depending on your driving habits, the actual price of gasoline in your area, and how often you give in to the temptation to exploit the engine’s performance. A lead foot will send that $2,500 figure skyward. More restrained driving, particularly on the highway, can bring it down somewhat. However, premium fuel is required, adding further to the running costs. Before owning, you can see all BMW fuel economy data to get a better idea how it stacks up.

Real-world expectations

While the EPA estimates provide a standardized benchmark, real-world fuel economy will almost certainly differ. Owners often report slightly lower MPG figures, particularly in city driving or if they regularly engage the car’s sportier driving modes. Expect something closer to 18 MPG in the city and perhaps 28 MPG on the highway if you drive with enthusiasm. Keep in mind that factors like tire pressure, ambient temperature, and the use of accessories like air conditioning can also impact fuel consumption. The more aggressive the driving style, the further your MPG will drift downward from the official numbers. Conversely, a conscious effort to drive smoothly and anticipate traffic can produce results closer to, or even slightly above, the EPA estimates.

How it compares

The 2016 BMW 435i Convertible exists in a competitive segment. The Audi A5 Cabriolet, with its 2.0T engine, achieves an EPA-rated 25 MPG combined, a noticeable advantage. The Mercedes-Benz C300 Cabriolet, another prime competitor, manages around 24 MPG combined with its turbocharged four-cylinder engine. The slightly larger and more powerful (though less sporty) Infiniti Q60 Convertible offered comparable fuel economy numbers when equipped with its V6. These differences matter to some buyers, but those drawn to the 435i Convertible often prioritize the specific driving feel and character of the BMW’s inline-six over a marginal increase in fuel efficiency, and a quick review of 435i MPG across all years can help contextualize this specific annual figure.

Tips to maximize efficiency

Take advantage of the “Eco Pro” driving mode. This setting adjusts throttle response, shift points, and climate control settings to prioritize fuel conservation. While it may temper the car’s performance, it can make a noticeable difference in MPG, mostly during around-town driving.

Maintain proper tire inflation. Under-inflated tires increase rolling resistance, which reduces fuel economy. Check your tire pressures regularly and inflate them to the recommended levels found on the doorjamb sticker.

Avoid excessive idling. Modern engines are surprisingly efficient when running, but idling burns fuel without covering any distance. If you anticipate being stopped for more than a minute, consider turning off the engine.

Drive smoothly and anticipate traffic flow. Avoid sudden acceleration and hard braking, which waste fuel. By looking ahead and maintaining a consistent speed, you can improve your MPG significantly.

Service the car regularly. A well-maintained engine is a more efficient engine. Follow the manufacturer’s recommended maintenance schedule, including oil changes, air filter replacements, and spark plug inspections, to ensure optimal performance and fuel economy.