The 2017 BMW 430i Convertible’s 27 MPG combined fuel economy won’t break any records, but it’s acceptable for a stylish convertible designed for weekend drives and occasional backroad fun. This car prioritizes the driving experience, open-air enjoyment, and responsive handling that BMW is known for, making the fuel consumption a reasonable trade-off for those who buy it.

City and highway performance

EPA estimates for the 2017 BMW 430i Convertible are 23 MPG in the city and 34 MPG on the highway. The city figure reflects urban driving’s stop-and-go conditions, where the 2.0L turbocharged engine’s efficiency suffers from frequent acceleration and idling. However, the highway number is impressive for a convertible, showing the engine’s ability to cruise efficiently at higher speeds. The 8-speed automatic transmission (S8) also helps, keeping the engine in its optimal rev range for increased fuel economy. This spread makes the 430i a good daily driver for suburban residents who take weekend road trips.

Annual fuel cost

The EPA estimates the 2017 BMW 430i Convertible’s annual fuel cost at $2,150. This is based on 15,000 miles per year and average national fuel prices. This is an estimate, and your actual costs will vary depending on your driving habits, fuel type, and local gas prices. Premium fuel is recommended for optimal performance, increasing real-world expenses beyond this projected amount.

Real-world expectations

While the EPA estimates offer a baseline, real-world fuel economy varies. Drivers who frequently accelerate quickly and use Sport mode will likely see numbers closer to the low 20s. Conversely, those who accelerate smoothly and maintain consistent highway speeds could exceed the EPA’s 34 MPG highway rating. Tire inflation, vehicle maintenance, and weather also impact fuel efficiency. Check 430I MPG across all years to compare EPA estimates between model years.

How it compares

The 2017 BMW 430i 2.0L is competitive compared to other convertibles in its class. The Audi A3 Cabriolet with its similar 2.0L turbo engine achieves around 29 MPG combined, slightly better than the BMW. The Mercedes-Benz C300 Cabriolet has a similar EPA rating of 26 MPG combined. More powerful options like the Ford Mustang EcoBoost Convertible (25 MPG combined) or the Chevrolet Camaro Convertible (22 MPG combined with the V6) trade fuel efficiency for increased performance. These comparisons are important for buyers prioritizing fuel efficiency, because there are more and less efficient sporty convertibles available.

Tips to maximize efficiency

Avoid aggressive acceleration. The 2.0L turbo engine in the 430i is responsive, but rapid acceleration burns fuel quickly. Instead, focus on smooth, gradual acceleration to maintain efficiency, especially when driving around town. Use the Eco Pro driving mode. This mode adjusts the engine mapping, transmission shift points, and climate control to maximize fuel efficiency. It may slightly reduce performance, but is useful in stop-and-go traffic.

Ensure your tires are properly inflated. Underinflated tires increase rolling resistance, which hurts fuel economy. Check your tire pressure regularly and inflate them to the recommended levels on the door jamb sticker. Watch for excessive rolling resistance (which can also make your car unsafe).

Minimize idling. Idling consumes fuel without covering any distance. If you anticipate a stop longer than 30 seconds, turn off the engine to conserve fuel. One exception is during extreme heat or cold, where restarting the climate control constantly may hurt fuel economy more than short engine-off periods.

Plan your routes to avoid traffic congestion. Stop-and-go traffic reduces fuel efficiency. Use navigation apps to identify and avoid heavily congested areas. Even a small route change can save fuel on a long commute.

Keep the top up at higher speeds. While open-air driving is a major draw of the 430i Convertible, lowering the top increases aerodynamic drag, lowering fuel economy at highway speeds. For longer highway drives, consider keeping the top up to improve efficiency. See all Bmw fuel economy data for more information on the brand’s fuel economy numbers.