19 MPG combined. The 2026 Porsche 911 Carrera GTS Cabriolet achieves this figure with remarkable efficiency, a car built almost exclusively for exhilarating performance. This isn’t a vehicle bought for its fuel economy; it’s a vehicle acquired for its unfiltered connection to the road, its iconic silhouette, and the intoxicating sound of its flat-six engine. The fact that it achieves even this level of efficiency is a bonus, a nod to Porsche’s relentless pursuit of refinement alongside raw power.

City and highway performance

The EPA rates the 2026 911 Carrera GTS Cabriolet at 17 MPG in the city and 23 MPG on the highway. Powering this precision machine is a 3.6L 6-cylinder engine, mated to Porsche’s lightning-fast Automatic (AM-S8) transmission. The city figure of 17 MPG reflects the stop-and-go nature of urban driving, where the inherent inefficiencies of frequent acceleration and braking are most pronounced. For a high-performance sports car with genuine track-day capabilities, this is a respectable number. It won’t win any awards for urban frugality, but it’s not punishing either. On the highway, the 23 MPG rating underscores the aerodynamic efficiency and intelligent gearing of the AM-S8. At cruising speeds, the engine operates in its most efficient RPM range, allowing for surprisingly decent long-distance economy for a vehicle of this caliber. Those open-road figures are what allow owners to enjoy spirited drives without constant anxiety about the next fuel stop.

Annual fuel cost

The EPA estimates an annual fuel cost of $3,050 for the 2026 Porsche 911 Carrera GTS Cabriolet. This figure assumes 15,000 miles of driving per year, split between city and highway, and calculated using national average fuel prices. It’s a useful benchmark for potential owners to understand the recurring operational expense. While $3,050 might seem significant in isolation, it’s a relatively minor consideration for a buyer of a high-performance luxury convertible. The cost of fuel pales in comparison to the vehicle’s initial purchase price, insurance, and maintenance. For the individual who values the GTS’s specific blend of performance, prestige, and open-air exhilaration, this annual fuel expenditure is simply part of the ownership experience, not a barrier to entry. It’s a reminder that premium performance comes with premium running costs, but within the context of this segment, it’s entirely expected.

Real-world expectations

In real-world driving, owners of the 2026 Porsche 911 Carrera GTS Cabriolet will find their fuel economy heavily influenced by their driving style. Enthusiastic back-road blasts, frequent hard accelerations, and open-top cruises at higher speeds will undoubtedly push figures closer to, or even below, the 17 MPG city rating. The immense torque and immediate power delivery of the 3.6L flat-six are highly addictive, and most owners simply won’t resist exploring its full potential. Conversely, disciplined highway cruising, especially outside of peak traffic, can see numbers approach or even slightly exceed the 23 MPG highway mark. The Automatic (AM-S8) transmission is incredibly technically advanced, and in its most efficient settings, it can extract impressive mileage from the engine. Ultimately, the GTS is designed to be driven with passion, and its fuel economy will directly reflect the joy and engagement its driver extracts from every journey.

How it compares

When stacked against its primary competitors, the 2026 Porsche 911 Carrera GTS Cabriolet’s 19 MPG combined figure holds its ground remarkably well. Consider the Mercedes-AMG SL 63 Roadster, which typically delivers around 16 MPG combined. Another rival, the BMW M8 Competition Convertible, often sees figures closer to 17 MPG combined. The GTS’s slightly lighter weight and highly optimized powertrain give it an edge in this rarefied segment where performance is important. Even within the 911 lineup, the GTS occupies a sweet spot; a base Carrera Cabriolet might nudge 20-21 MPG combined, but without the GTS’s enhanced performance credentials. A more extreme sibling, like a 911 Turbo S Cabriolet, would likely dip to 17-18 MPG combined. The 19 MPG from the GTS offers an excellent balance, demonstrating Porsche’s ability to wring a surprising level of efficiency from a high-output sports car built for enjoyment, not economy runs. It highlights a pragmatic approach to performance vehicle engineering, where every aspect is optimized. Find more about all Porsche fuel economy data.

Tips to maximize efficiency

While the GTS is not about economy, a few mindful habits can help you make the most of each tank. Gentle throttle inputs are key; avoid unnecessary full-throttle bursts, especially when merging or passing, and let the ample torque do the work in higher gears where possible.

Use the 911’s coasting function when appropriate. The AM-S8 transmission can decouple the engine from the drivetrain under specific conditions, allowing the car to glide, conserving fuel without sacrificing momentum significantly.

Maintain proper tire pressure. The GTS’s high-performance tires are critical for handling, but correctly inflated tires also reduce rolling resistance, which contributes directly to better fuel economy.

Plan your routes to avoid heavy traffic and excessive idling. The city MPG rating is the lowest for a reason, and minimizing stop-and-go driving will have the most significant impact on your overall fuel consumption. For more details on this model, check out 911 MPG across all years.

Consider using the most efficient driving mode when conditions permit. While the GTS begs to be driven in Sport or Sport+, the Normal mode offers a more relaxed throttle map and earlier gear changes, which are conducive to better fuel economy during routine commutes.