The 2020 BMW Z4 sDrive30i, with its 2.0L 4-cylinder engine, gets a combined fuel economy of 27 MPG. This isn’t a hybrid, and it’s not trying to be. That number reflects the vehicle’s main purpose: driving enjoyment. It’s not intended as a super-efficient daily commuter; it’s a roadster made for fun weekend drives with the top down, and its fuel economy is a reasonable tradeoff for its performance and style.

City and highway performance

The EPA estimates the Z4 sDrive30i at 24 MPG in the city and 32 MPG on the highway. The city rating reflects typical stop-and-go driving. The sDrive30i’s quick acceleration and responsive throttle contribute to the lower city MPG. On the highway, the engine shows that it’s efficient when cruising. The eight-speed automatic transmission helps keep the engine at the right RPM to save fuel on long drives.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2020 BMW Z4 sDrive30i at $2,150. This is based on driving 15,000 miles per year, using national average fuel prices. Remember that this is only an estimate. What you actually spend on fuel will depend on how you drive, the type of fuel you buy, and where you live, since fuel prices change by region. The EPA’s estimate gives you a good way to compare the Z4’s running costs to other similar vehicles. Z4 buyers probably care less about squeezing every last mile out of each gallon of gas than someone shopping for a hybrid sedan. The annual fuel cost is still something to consider when you own a vehicle.

Real-world expectations

EPA estimates are helpful, but real-world fuel economy often varies. Z4 drivers often report numbers close to the EPA estimates, especially on longer highway trips. Aggressive driving, frequent short trips, and using Sport mode often will reduce fuel economy. The Z4’s responsive engine and agile handling make you want to drive fast, and it’s easy to enjoy yourself so much that you get lower MPG. Depending on how you drive and road conditions, expect fuel economy from the low 20s to the high 20s when combining city and highway driving.

How it compares

Compared to other roadsters, all Bmw fuel economy data shows the Z4 sDrive30i has competitive fuel efficiency. The Porsche 718 Boxster, with its base 2.0L engine, gets a slightly lower 25 MPG combined. The Mazda MX-5 Miata, which is lighter and less powerful, gets a higher 30 MPG combined. The Miata is made for lightness and agility, while the Boxster puts performance first, with a higher price. The Audi TT Roadster gets around 26 MPG combined with its 2.0T engine. Each car is built for a specific purpose. For those who want performance, luxury, and style in a convertible, the Z4 sDrive30i’s fuel economy is a good compromise. You can see the Z4 MPG across all years.

Tips to maximize efficiency

Avoid accelerating too fast. The Z4’s turbocharger delivers strong power, but using bursts of speed uses more fuel. Accelerate smoothly and gradually to help the engine run more efficiently.

If possible, use Eco Pro driving mode. This mode adjusts the car’s systems to save fuel, changing throttle response and shift patterns. It’s best for highway cruising or easy driving.

Check that your tires are properly inflated. Tires with low pressure increase rolling resistance, which reduces fuel economy. Check your tire pressure regularly and keep it at the level shown on the sticker inside the driver’s side doorjamb.

Reduce wind resistance. Driving with the top down is part of the Z4 experience, but it also increases wind resistance, which reduces fuel economy. On long highway drives, consider raising the top to save fuel.

Don’t carry extra weight. Extra cargo in the trunk or a lot of passengers will lower fuel economy. Take out any unnecessary items from the car to make it lighter and save fuel.