The 2023 Porsche 718 Boxster GTS 4.0L, rated at 21 MPG combined, clearly focuses on driving excitement over maximizing gas mileage. It’s not a commuter car but a precision instrument engineered for a visceral driving experience, and the fuel economy reflects this focus.

City and highway performance

The EPA estimates 19 MPG in the city and 24 MPG on the highway for the 718 Boxster GTS 4.0L when equipped with the automatic (AM-S7) transmission. These figures, while not stellar, are within the expected range for a high-performance sports car with a naturally aspirated 4.0-liter flat-six engine. City driving, due to stop-and-go traffic, will impact fuel consumption more. However, on the open road, the Boxster GTS 4.0L can stretch its fuel a bit further although the temptation to explore the upper limits of its engine’s performance is ever-present. Driver behavior greatly impacts real-world fuel economy, so expect worse city mileage than highway mileage if driving is spirited.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2023 Porsche 718 Boxster GTS 4.0L to be $2,750. This is based on driving 15,000 miles per year and national average fuel prices. Premium fuel is required, which increases that cost compared to economy cars that use regular gas. Actual fuel costs will vary according to individual driving habits and local fuel prices. Aggressive driving will increase this annual expense, as will frequent track days.

Real-world expectations

Owners of the 718 Boxster GTS 4.0L probably aren’t buying this car for its fuel efficiency anyway. This is a car well-suited for weekend drives, canyon roads, and occasional track days. Consequently, many owners will likely see real-world fuel economy slightly below the EPA estimates, especially if they frequently indulge in the car’s performance. Expect an average in the high teens if you drive aggressively, with a peak in the lower 20s if you’re taking it easy. Many think the trade-off for the car’s performance and driving enjoyment is worth the cost at the pump. Compare 718 MPG across all years to spot trends over time.

How it compares

Compared to other high-performance sports cars, the 2023 Porsche 718 Boxster GTS 4.0L’s fuel economy is fairly typical. A comparable BMW M4 Competition convertible achieves around 18 MPG combined, while a Chevrolet Corvette Stingray convertible manages a slightly better 19 MPG combined. The Porsche’s relative efficiency likely stems from its smaller engine size and lower curb weight. For more information, buyers should compare all Porsche fuel economy data to other brands, also considering performance. If fuel efficiency is a primary concern, there are numerous other sports cars on the market. But the 718 Boxster GTS 4.0L offers a unique blend of performance, handling, and driver engagement that is hard to replicate, its primary mission is not economy or low cost of ownership.

Tips to maximize efficiency

While efficiency might not be a priority, you can still find ways to optimize fuel consumption in your 718 Boxster GTS 4.0L. Avoid aggressive acceleration and braking, as these habits will significantly reduce fuel economy. Gentle and deliberate inputs will help maintain momentum and minimize fuel waste.

Strategically use the car’s driving modes. The “Normal” or “Eco” mode, if equipped, will optimize engine and transmission settings for fuel efficiency by reducing throttle response and shifting at lower RPMs. Consider using these modes for highway cruising or when driving in congested city traffic.

Ensure that your tires are properly inflated. Underinflated tires increase rolling resistance, which negatively impacts fuel economy. Check your tire pressure regularly and maintain the recommended pressure on the door jamb sticker.

Minimize unnecessary weight in the car. Extra weight increases the engine’s workload and reduces fuel efficiency. Remove any unnecessary items from the trunk and passenger compartment.

Plan your routes strategically to avoid stop-and-go traffic. Idling consumes fuel without covering any distance. Use navigation apps to identify traffic congestion and choose alternative routes if possible.