26 MPG combined isn’t going to win any awards for efficiency, but it’s an acceptable figure for the 2024 BMW Z4 M40i, a two-seat roadster dedicated to performance and spirited driving. Buyers aren’t prioritizing fuel sipping when they buy a Z4 M40i; they are prioritizing the intoxicating rush of a turbocharged inline-six and the feeling of open-air motoring. This fuel economy reflects that inherent trade-off.

City and highway performance

The EPA estimates the Z4 M40i will achieve 23 MPG in city driving and 31 MPG on the highway. This spread reflects the car’s tuning and engineering. The eight-speed automatic transmission is geared for brisk acceleration off the line, explaining the city MPG figure. On the open road, the Z4 settles into a more efficient cruising gear, allowing that highway number to climb. Understanding that maximizing highway MPG requires resisting the urge to use the engine’s ample power is key. The driver plays an important role.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 BMW Z4 M40i at $2,250. This figure is based on driving 15,000 miles per year, with a mix of city and highway driving. It further assumes the use of gasoline priced at the national average. Variables will naturally affect the ultimate cost: driving habits, local fuel prices, and the number of miles driven annually. If someone drives significantly more than the average or has a lead foot, that $2,250 figure will quickly climb.

Real-world expectations

The EPA provides a standardized benchmark, but real-world MPG can vary noticeably. Drivers who frequently accelerate aggressively, spend extended periods in stop-and-go traffic, or drive mostly in the city are likely to see figures below the EPA estimates. However, drivers who accelerate smoothly, minimize idling, and mainly drive on the highway have a better chance of meeting or even exceeding the EPA’s 31 MPG highway rating. The Z4 M40i is a performance car, and its fuel economy is directly tied to its driver’s behavior.

How it compares

The Z4 M40i occupies a unique niche. The Porsche 718 Boxster S, a direct competitor, offers slightly better fuel economy at 22 MPG city and 28 MPG highway. However, many find the BMW’s inline-six engine more engaging than the Porsche’s four-cylinder. The Mercedes-Benz SLC 300, another potential rival, manages around 23 MPG combined. The SLC is now discontinued, making the Z4 M40i even more interesting. A similarly equipped Supra 3.0, which shares its engine with the Z4 M40i, offers almost identical fuel economy numbers. Ultimately, the buying decision rests on brand preference and stylistic choices.

Tips to maximize efficiency

Take advantage of the Z4 M40i’s driving modes. Selecting “Eco Pro” mode alters the throttle response and shift points. The changes encourage a lighter touch on the accelerator and more efficient gear selection. It might slightly diminish the car’s performance feel, but it can noticeably improve fuel economy, especially during everyday commuting.

Maintain proper tire inflation. Underinflated tires increase rolling resistance, which directly harms fuel economy. Check your tire pressure regularly and inflate them to the manufacturer’s recommended levels. The correct pressure is usually listed on a sticker inside the driver’s side door jamb. This simple task can noticeably affect fuel consumption.

Anticipate traffic flow to minimize abrupt acceleration and braking. Read the road ahead and maintain a consistent speed whenever possible. Avoiding unnecessary bursts of acceleration and hard braking not only improves fuel economy but also contributes to a smoother, more enjoyable driving experience. The car’s responsiveness makes this easier.

When possible, avoid extended idling. If you are stopped for more than a minute or two, turn off the engine. Modern engines, like the BMW’s, are designed to restart quickly and efficiently. Excessive idling wastes fuel and produces unnecessary emissions. Many newer cars even have an automatic start/stop feature that handles this task automatically.

Ensure your Z4 M40i is properly maintained. Regular oil changes, air filter replacements, and spark plug maintenance are essential for optimal engine performance and fuel efficiency. A well-maintained engine runs more smoothly and efficiently than one that is neglected. Refer to your owner’s manual for the recommended maintenance schedule.

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