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Mercedes GLS vs Porsche 911 Convertible comparison

Compare performance (404 HP vs 711 HP), boot space and price (92,700 £ vs 138,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes GLS or Porsche 911 Convertible?

Mercedes GLS vs Porsche 911 Convertible: Key differences

Mercedes GLS

  • clearly cheaper
  • noticeably more efficient
details

Porsche 911 Convertible

  • considerably more power
  • considerably quicker 0–100 km/h
  • substantially lighter
  • barely more trunk space
details

By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

GLS

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

Mercedes GLS is clearly cheaper – starting at 92,700 £ , while the Porsche 911 Convertible costs 138,000 £ . That’s a price difference of around 45,338 £.

Fuel consumption also shows a difference: the Mercedes GLS uses 7.9 L/100km and is noticeably more efficient than the Porsche 911 Convertible with 10.5 L/100km. The difference is about 2.6 L/100km.

911 Convertible

Engine and Performance:

Power, torque and acceleration say a lot about how a car feels on the road. This is where you see which model delivers more driving dynamics.

When it comes to engine power, the Porsche 911 Convertible offers considerably more power – delivering 711 HP compared to 404 HP. That’s roughly 307 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche 911 Convertible is considerably quicker – completing the sprint in 2.6 s, while the Mercedes GLS takes 5.6 s. That’s about 3 s quicker.

There’s also a difference in torque: the Porsche 911 Convertible delivers marginally more torque with 800 Nm compared to 750 Nm. That’s about 50 Nm more.

GLS

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Seats: Mercedes GLS offers more seats – 7 vs 4.

In terms of curb weight, Porsche 911 Convertible is substantially lighter – 1,572 kg compared to 2,580 kg. The difference is around 1,008 kg.

Looking at boot space, the Porsche 911 Convertible offers barely more boot space – 373 L compared to 355 L. That’s a difference of about 18 L.

When it comes to payload, the Mercedes GLS carries substantially more – 820 kg compared to 345 kg. That’s a difference of about 475 kg.

Who wins the race in the data check?

The Porsche 911 Convertible is decisively ahead in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £138,000
911 Convertible

Porsche 911 Convertible

  • Engine Type Petrol, Full Hybrid
  • Transmission Manuel, Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 394 - 711 HP
  • Consumption L/100km 10.5 - 13.7 L/100km
details

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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes GLS

The GLS — usually just called the GLS — is Mercedes' flagship SUV, wrapping limousine-like comfort and commanding road presence into a smart, family-ready package. It pampers occupants with a hushed cabin, premium materials and intuitive tech, while still managing to feel confident and a little indulgent on the daily commute.

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Reviews Mercedes GLS

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Porsche 911 Convertible

The Porsche 911 Cabriolet transforms the iconic silhouette into an open‑air weapon, offering roof-down glamour and razor-sharp handling that still feels perfectly composed on normal roads. It’s the kind of car that serves daily duties with surprising ease while delivering intoxicating engine music and a grin factor that makes every trip feel like a small victory.

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Reviews Porsche 911 Convertible

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Mercedes GLS
Porsche 911 Convertible

Costs and Consumption
Price
92,700 - 104,600 £
Price
138,000 - 244,500 £
Consumption L/100km
7.9 - 9.9 L/100km
Consumption L/100km
10.5 - 13.7 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
206 - 226 g/km
co2
237 - 310 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
Convertible
Seats
7
Seats
2 - 4
Doors
-
Doors
-
Curb weight
2,580 - 2,670 kg
Curb weight
1,572 - 1,900 kg
Trunk capacity
355 L
Trunk capacity
163 - 373 L
Length
-
Length
-
Width
1,956 mm
Width
1,852 - 1,900 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
810 - 820 kg
Payload
195 - 345 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel MHEV
Engine Type
Petrol, Full Hybrid
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
336 - 404 HP
Power HP
394 - 711 HP
Acceleration 0-100km/h
5.6 - 6.2 s
Acceleration 0-100km/h
2.6 - 4.7 s
Max Speed
-
Max Speed
-
Torque
560 - 750 Nm
Torque
450 - 800 Nm
Number of Cylinders
6
Number of Cylinders
6
Power kW
247 - 297 kW
Power kW
290 - 523 kW
Engine capacity
2,989 - 2,999 cm3
Engine capacity
2,981 - 3,996 cm3

General
Model Year
2026
Model Year
2,024 - 2,026
CO2 Efficiency Class
G
CO2 Efficiency Class
G
Brand
Mercedes-Benz
Brand
Porsche
Is the Mercedes GLS offered with different drivetrains?

The Mercedes GLS is available as All-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.