16 MPG combined is a figure that will likely elicit winces from the Prius crowd, but for the enthusiast who buys a 2024 Porsche 718 GT4 RS, it’s likely an afterthought. This isn’t a car designed for commuting or maximizing fuel efficiency; it’s a scalpel-sharp, naturally aspirated track weapon homologated for the street. Owners are far more concerned with lap times, cornering grip, and the banshee wail of that glorious flat-six engine than with saving a few dollars at the pump. These buyers are motivated by performance above all else, and this Porsche delivers it in spades.

City and highway performance

The EPA estimates the 718 GT4 RS at 15 MPG in the city and 19 MPG on the highway. Those figures reflect the inherent compromise in a high-performance machine. The city number suffers due to frequent stops and starts, and the need to use lower gears to navigate traffic. The highway number is better, but still reflects that even at cruising speed, the engine is tuned for immediate throttle response and potent acceleration, rather than optimized fuel consumption. The aerodynamic package contributes to significant downforce, but also adds drag, which negatively impacts highway fuel economy.

Annual fuel cost

The EPA estimates the annual fuel cost for the 2024 Porsche 718 GT4 RS at $3,600. This calculation is based on driving 15,000 miles per year, with 45% of those miles driven in the city and 55% driven on the highway, using national average fuel prices. It’s important to remember that this is just an estimate. Actual fuel costs can vary significantly depending on individual driving habits, local fuel prices, and the percentage of time spent on the track versus public roads. Given the nature of this car, it’s safe to assume many owners will likely exceed the 15,000-mile threshold, and fuel costs will climb accordingly.

Real-world expectations

While the EPA provides a benchmark, real-world fuel economy for the GT4 RS will likely fall below those numbers, particularly for owners who frequently indulge in the car’s performance capabilities. Aggressive acceleration, frequent track days, and spirited weekend drives will inevitably lead to lower MPG. Single-digit fuel economy during track sessions is not uncommon. For those using the car primarily for short, enthusiastic drives on weekends, the EPA estimates may be a reasonable guide. However, consistent commuting in heavy traffic is likely to depress the MPG figures.

How it compares

Compared to other high-performance sports cars, the 718 GT4 RS’s fuel economy falls on the lower end of the spectrum. For example, the Chevrolet Corvette Z06 boasts considerably more power, but manages around 15 MPG city and 24 MPG highway. A BMW M4 Competition gets 16 MPG city and 23 MPG highway, making it a more efficient option, but one that delivers a distinctly different driving experience. Even within the Porsche family, a 911 Carrera S offers around 18 MPG city and 24 MPG highway. These comparisons reveal the trade-off in the GT4 RS’s extreme focus on track performance. Outright performance and exclusivity matter to the driver, where fuel economy is a secondary concern.

Tips to Maximize Efficiency

While maximizing fuel efficiency might not be the primary goal of a GT4 RS owner, there are still ways to conserve fuel. Avoid aggressive acceleration and braking when possible, as the car’s powerful engine and track-focused brakes consume more fuel during these maneuvers. Use smoother, more gradual inputs to minimize fuel waste.

Proper tire inflation is critical not only for optimal handling but also for fuel efficiency. Ensure the tires are inflated to the recommended pressure, as underinflated tires increase rolling resistance and decrease fuel economy. Check tire pressures regularly, especially before longer drives or track sessions.

Avoid unnecessary idling. The GT4 RS’s engine is designed to operate efficiently at speed, not sitting still. If you’re stopped for more than a minute or two, shut off the engine to conserve fuel. This is a simple habit that can make a noticeable difference over time.

Consider minimizing the use of air conditioning, especially during cooler weather. The AC compressor puts an extra load on the engine, reducing fuel economy. Open the windows and enjoy the natural airflow when possible.

Finally, all Porsche fuel economy data, including 718 MPG across all years, reveals a trend: ultimate performance often comes at the cost of efficiency. Accept this truth and revel in the GT4 RS’s unmatched driving prowess.