Achieving 26 MPG combined, the 2015 BMW Z4 sDrive28i isn’t aiming to set any fuel efficiency records. It’s a two-seat roadster designed for spirited weekend drives, not cross-country economy runs. The Z4 buyer prioritizes sharp handling, open-air enjoyment, and the distinctive BMW driving experience; fuel efficiency plays a secondary role, provided it’s reasonable for the performance.

City and highway performance

The EPA estimates for the Z4 sDrive28i place city driving at 22 MPG and highway driving at 32 MPG. The city number reflects the stop-and-go nature of urban environments, where the turbocharged 2.0-liter engine is frequently used for bursts of acceleration. The highway figure is more respectable, showcasing the engine’s efficiency at a steady cruise, aided by the smooth-shifting 8-speed automatic transmission. This transmission plays an important role, keeping the engine in its optimal rev range for both performance and fuel consumption. The automatic features closely spaced gears that minimize wasted revs when accelerating.

Annual fuel cost

Based on the EPA’s estimates, expect to spend approximately $2,250 per year fueling your 2015 BMW Z4 sDrive28i. This figure is calculated assuming 15,000 miles of driving annually, using the national average fuel price for premium unleaded gasoline, which is required for the 2.0L engine to achieve optimal performance and efficiency. Individual fuel costs will vary depending on driving habits, local fuel prices, and the proportion of city versus highway miles driven.

Real-world expectations

While the EPA figures provide a useful benchmark, real-world MPG often deviates, especially in a car like the Z4. The sDrive28i’s rewarding performance encourages enthusiastic driving, which will naturally impact fuel economy. Expect closer to 20 MPG in the city if you spend a lot of time in heavy traffic or if you frequently use the engine’s power. On long highway journeys, it’s possible to exceed the EPA’s 32 MPG estimate, particularly if you maintain a steady speed and avoid excessive acceleration. Many drivers achieve MPG figures similar to the EPA highway number. Carefully selecting the drive mode can change the real-world MPG they experience.

How it compares

Compared to other roadsters, the Z4 sDrive28i’s fuel economy is generally competitive for its performance class. The Porsche 718 Boxster, with its base 2.0-liter engine and PDK transmission, manages a slightly better 24 MPG city and 30 MPG highway. The Nissan 370Z Roadster ,although a very different car with its larger V6, gets around 17 MPG city and 25 MPG highway, showcasing the efficiency gains offered by the Z4’s smaller, turbocharged engine and modern transmission. For more information, browse Z4 MPG across all years. For all Bmw fuel economy data, FuelEconomyHub is your best source.

Tips to maximize efficiency

Take advantage of the Z4’s driving modes. Select “Eco Pro” mode for everyday driving to optimize fuel consumption. This mode adjusts throttle response and shift points to prioritize efficiency, providing a noticeable improvement in MPG.

Ensure your tires are properly inflated to the recommended pressure. Underinflated tires increase rolling resistance, which translates to reduced fuel economy. Check your tire pressure regularly, especially during temperature changes, to maintain optimal efficiency.

Anticipate traffic flow and avoid aggressive acceleration and braking. Smooth driving not only improves fuel economy but also enhances the overall driving experience. Minimize abrupt starts and stops, and maintain a consistent speed whenever possible.

Service your Z4 according to the manufacturer’s recommendations. Regular maintenance, including oil changes, air filter replacements, and spark plug inspections, ensures that your engine is running efficiently. A well-maintained engine delivers better fuel economy and performance.

Minimize idling. If you anticipate being stopped for more than a minute or two, turn off the engine. Idling consumes fuel without covering any distance. This is especially important in city driving, where you might spend a significant amount of time waiting at traffic lights or in stop-and-go traffic.