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Mercedes C-Class Saloon vs Porsche 911 Convertible comparison

Compare performance (680 HP vs 711 HP), boot space and price (41,300 £ vs 138,000 £ ) at a glance. Find out which car is the better choice for you – Mercedes C-Class Saloon or Porsche 911 Convertible?

Mercedes C-Class Saloon vs Porsche 911 Convertible: Key differences

Mercedes C-Class Saloon

  • substantially cheaper
  • substantially more efficient
  • moderately more trunk space
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Porsche 911 Convertible

  • barely more power
  • noticeably quicker 0–100 km/h
  • marginally lighter
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Here’s where it gets real: The technical differences in detail

C-Class Saloon

Costs and Efficiency:

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

Mercedes C-Class Saloon is substantially cheaper – starting at 41,300 £ , while the Porsche 911 Convertible costs 138,000 £ . That’s a price difference of around 96,675 £.

Fuel consumption also shows a difference: the Mercedes C-Class Saloon uses 4.5 L/100km and is substantially more efficient than the Porsche 911 Convertible with 10.5 L/100km. The difference is about 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 barely more power – delivering 711 HP compared to 680 HP. That’s roughly 31 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche 911 Convertible is noticeably quicker – completing the sprint in 2.6 s, while the Mercedes C-Class Saloon takes 3.4 s. That’s about 0.8 s quicker.

There’s also a difference in torque: the Mercedes C-Class Saloon delivers markedly more torque with 1,020 Nm compared to 800 Nm. That’s about 220 Nm more.

C-Class Saloon

Space and Everyday Use:

Cabin size, boot volume and payload all play a role in everyday practicality. Here, comfort and flexibility make the difference.

Seats: Mercedes C-Class Saloon offers more seats – 5 vs 4.

In terms of curb weight, Porsche 911 Convertible is marginally lighter – 1,572 kg compared to 1,695 kg. The difference is around 123 kg.

Looking at boot space, the Mercedes C-Class Saloon offers moderately more boot space – 455 L compared to 373 L. That’s a difference of about 82 L.

When it comes to payload, the Mercedes C-Class Saloon carries visibly more – 570 kg compared to 345 kg. That’s a difference of about 225 kg.

Who wins the race in the data check?

The Mercedes C-Class Saloon holds a decisive overall lead 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 £41,300
C-Class Saloon

Mercedes C-Class Saloon

  • Engine Type Petrol MHEV, Diesel MHEV, Plug-in Hybrid
  • Transmission Automatic
  • Drive Type Rear-Wheel Drive, All-Wheel Drive
  • Power HP 183 - 680 HP
  • Consumption L/100km 4.5 - 9 L/100km
  • Electric Range 11 km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Mercedes C-Class Saloon

The Mercedes C‑Class is the compact executive that dresses like it owns the boulevard, with an interior that blends modern elegance and plush comfort to make everyday driving feel unexpectedly special. On the road it pairs poise with a hint of cheeky agility, rewarding drivers who want refinement without forfeiting a touch of fun — and yes, it still looks great in the driveway.

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Reviews Mercedes C-Class Saloon

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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 C-Class Saloon
Porsche 911 Convertible

Costs and Consumption
Price
41,300 - 103,400 £
Price
138,000 - 244,500 £
Consumption L/100km
4.5 - 9 L/100km
Consumption L/100km
10.5 - 13.7 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
11 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
119 - 205 g/km
co2
237 - 310 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
Convertible
Seats
5
Seats
2 - 4
Doors
-
Doors
-
Curb weight
1,695 - 2,165 kg
Curb weight
1,572 - 1,900 kg
Trunk capacity
280 - 455 L
Trunk capacity
163 - 373 L
Length
-
Length
-
Width
1,820 - 1,900 mm
Width
1,852 - 1,900 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
485 - 570 kg
Payload
195 - 345 kg

Engine and Performance
Engine Type
Petrol MHEV, Diesel MHEV, Plug-in Hybrid
Engine Type
Petrol, Full Hybrid
Transmission
Automatic
Transmission
Manual, Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
183 - 680 HP
Power HP
394 - 711 HP
Acceleration 0-100km/h
3.4 - 8.6 s
Acceleration 0-100km/h
2.6 - 4.7 s
Max Speed
-
Max Speed
-
Torque
250 - 1,020 Nm
Torque
450 - 800 Nm
Number of Cylinders
4
Number of Cylinders
6
Power kW
135 - 500 kW
Power kW
290 - 523 kW
Engine capacity
1,496 - 1,999 cm3
Engine capacity
2,981 - 3,996 cm3

General
Model Year
2,024 - 2,025
Model Year
2,024 - 2,026
CO2 Efficiency Class
E, D, G
CO2 Efficiency Class
G
Brand
Mercedes-Benz
Brand
Porsche
What drivetrain options does the Mercedes C-Class Saloon have?

The Mercedes C-Class Saloon is available as Rear-Wheel Drive or 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.