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Fiat 500 Convertible vs Mercedes GLS comparison

Compare performance (118 HP vs 404 HP), boot space and price (19,700 £ vs 92,700 £ ) at a glance. Find out which car is the better choice for you – Fiat 500 Convertible or Mercedes GLS?

Fiat 500 Convertible vs Mercedes GLS: Key differences

Fiat 500 Convertible

  • significantly cheaper
  • considerably more efficient
  • clearly lighter
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Mercedes GLS

  • significantly more power
  • considerably quicker 0–100 km/h
  • clearly more trunk space
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By Achim Sedelmaier

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

500 Convertible

Costs and Efficiency:

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

Fiat 500 Convertible is significantly cheaper – starting at 19,700 £ , while the Mercedes GLS costs 92,700 £ . That’s a price difference of around 72,957 £.

Fuel consumption also shows a difference: the Fiat 500 Convertible uses 5.2 L/100km and is considerably more efficient than the Mercedes GLS with 7.9 L/100km. The difference is about 2.7 L/100km.

GLS

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 Mercedes GLS offers significantly more power – delivering 404 HP compared to 118 HP. That’s roughly 286 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes GLS is considerably quicker – completing the sprint in 5.6 s, while the Fiat 500 Convertible takes 9 s. That’s about 3.4 s quicker.

There’s also a difference in torque: the Mercedes GLS delivers clearly more torque with 750 Nm compared to 220 Nm. That’s about 530 Nm more.

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 GLS offers more seats – 7 vs 4.

In terms of curb weight, Fiat 500 Convertible is clearly lighter – 1,150 kg compared to 2,580 kg. The difference is around 1,430 kg.

Looking at boot space, the Mercedes GLS offers clearly more boot space – 355 L compared to 183 L. That’s a difference of about 172 L.

When it comes to payload, the Mercedes GLS carries substantially more – 820 kg compared to 325 kg. That’s a difference of about 495 kg.

Who wins the race in the data check?

The Fiat 500 Convertible 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 £19,700
500 Convertible

Fiat 500 Convertible

  • Engine Type Electric, Petrol MHEV
  • Transmission Automatic, Manuel
  • Drive Type Front-Wheel Drive
  • Power HP 65 - 118 HP
  • Consumption L/100km 5.2 - 5.3 L/100km
  • Consumption kWh/100km 13 - 14.9 kWh/100km
  • Electric Range 190 - 313 km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Fiat 500 Convertible

The Fiat 500 Convertible is a cheeky, retro-styled roof-down city car that turns heads and makes short trips feel like mini vacations. It’s more about charm and personality than practicality, ideal for style-conscious buyers who prefer fun and flair over brute practicality.

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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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Mercedes GLS

Costs and Consumption
Price
19,700 - 28,300 £
Price
92,700 - 104,600 £
Consumption L/100km
5.2 - 5.3 L/100km
Consumption L/100km
7.9 - 9.9 L/100km
Consumption kWh/100km
13 - 14.9 kWh/100km
Consumption kWh/100km
-
Electric Range
190 - 313 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
0 - 123 g/km
co2
206 - 226 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
SUV
Seats
4
Seats
7
Doors
-
Doors
-
Curb weight
1,150 - 1,480 kg
Curb weight
2,580 - 2,670 kg
Trunk capacity
183 L
Trunk capacity
355 L
Length
-
Length
-
Width
1,683 - 1,684 mm
Width
1,956 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
250 - 325 kg
Payload
810 - 820 kg

Engine and Performance
Engine Type
Electric, Petrol MHEV
Engine Type
Petrol MHEV, Diesel MHEV
Transmission
Automatic, Manuel
Transmission
Automatic
Transmission Detail
Reduction Gearbox, Manual Gearbox
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive
Drive Type
All-Wheel Drive
Power HP
65 - 118 HP
Power HP
336 - 404 HP
Acceleration 0-100km/h
9 - 17.3 s
Acceleration 0-100km/h
5.6 - 6.2 s
Max Speed
-
Max Speed
-
Torque
92 - 220 Nm
Torque
560 - 750 Nm
Number of Cylinders
3
Number of Cylinders
6
Power kW
48 - 87 kW
Power kW
247 - 297 kW
Engine capacity
999 cm3
Engine capacity
2,989 - 2,999 cm3

General
Model Year
2,025 - 2,026
Model Year
2026
CO2 Efficiency Class
A, D
CO2 Efficiency Class
G
Brand
Fiat
Brand
Mercedes-Benz
What drive types are available for the Fiat 500 Convertible?

The Fiat 500 Convertible is available as Front-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.