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Kia Stonic vs Mercedes GLS comparison

Compare performance (115 HP vs 404 HP), boot space and price (20,400 £ vs 92,700 £ ) at a glance. Find out which car is the better choice for you – Kia Stonic or Mercedes GLS?

Kia Stonic vs Mercedes GLS: Key differences

Kia Stonic

4.6 (2 Reviews)
rate
  • clearly cheaper
  • significantly more efficient
  • significantly lighter
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Mercedes GLS

  • substantially more power
  • considerably quicker 0–100 km/h
  • marginally more trunk space
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All details on performance, efficiency, range and trunk space can be found in the technical comparison below – including user reviews for both models.

By Achim Sedelmaier

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

Stonic

Costs and Efficiency:

When it comes to price and running costs, the biggest differences usually appear. This is often where you see which car fits your budget better in the long run.

Kia Stonic is clearly cheaper – starting at 20,400 £ , while the Mercedes GLS costs 92,700 £ . That’s a price difference of around 72,271 £.

Fuel consumption also shows a difference: the Kia Stonic uses 5.6 L/100km and is significantly more efficient than the Mercedes GLS with 7.9 L/100km. The difference is about 2.3 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 substantially more power – delivering 404 HP compared to 115 HP. That’s roughly 289 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 Kia Stonic takes 10.7 s. That’s about 5.1 s quicker.

There’s also a difference in torque: the Mercedes GLS delivers substantially more torque with 750 Nm compared to 200 Nm. That’s about 550 Nm more.

Stonic

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 5.

In terms of curb weight, Kia Stonic is significantly lighter – 1,205 kg compared to 2,580 kg. The difference is around 1,375 kg.

Looking at boot space, the Mercedes GLS offers marginally more boot space – 355 L compared to 352 L. That’s a difference of about 3 L.

When it comes to payload, the Mercedes GLS carries significantly more – 820 kg compared to 445 kg. That’s a difference of about 375 kg.

Who wins the race in the data check?

The Kia Stonic stands well ahead of its rival 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 £20,400
Stonic

Kia Stonic

  • Engine Type Petrol, Petrol MHEV
  • Transmission Manuel, Automatic
  • Drive Type Front-Wheel Drive
  • Power HP 100 - 115 HP
  • Consumption L/100km 5.6 - 5.7 L/100km
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Kia Stonic
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Kia Stonic

The Kia Stonic is a compact crossover that pairs nimble city manners with a surprisingly spacious and comfortable cabin. It’s a practical, well-equipped choice for buyers who value sensible features, approachable styling and easy everyday usability.

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Reviews Kia Stonic

4.6 (2 Reviews)
rate
Jan
18 Mar 2026, 07:19:10

Very good car, uses little fuel, nothing's gone wrong in 4 years, no breakdowns.

How do you mainly use this car? (optional): Commuter (short/medium distance)
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money
Ennio
4 Feb 2026, 13:19:36

I'm very satisfied — I have a Stonic Black Edition hybrid, and I haven't had any problems after two years.

How do you mainly use this car? (optional): Family car
Efficiency / Consumption & Range
Comfort & Interior
Driving Fun / Performance
Technology & Infotainment
Safety
Practicality / Trunk & Everyday Use
Value for Money

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

No reviews yet. Share your experience and help others decide.

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Kia Stonic
Mercedes GLS

Costs and Consumption
Price
20,400 - 26,800 £
Price
92,700 - 104,600 £
Consumption L/100km
5.6 - 5.7 L/100km
Consumption L/100km
7.9 - 9.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
126 - 128 g/km
co2
206 - 226 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
SUV
Body Type
SUV
Seats
5
Seats
7
Doors
-
Doors
-
Curb weight
1,205 - 1,270 kg
Curb weight
2,580 - 2,670 kg
Trunk capacity
352 L
Trunk capacity
355 L
Length
-
Length
-
Width
1,760 mm
Width
1,956 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
440 - 445 kg
Payload
810 - 820 kg

Engine and Performance
Engine Type
Petrol, Petrol MHEV
Engine Type
Petrol MHEV, Diesel MHEV
Transmission
Manuel, Automatic
Transmission
Automatic
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive
Drive Type
All-Wheel Drive
Power HP
100 - 115 HP
Power HP
336 - 404 HP
Acceleration 0-100km/h
10.7 - 12.1 s
Acceleration 0-100km/h
5.6 - 6.2 s
Max Speed
-
Max Speed
-
Torque
172 - 200 Nm
Torque
560 - 750 Nm
Number of Cylinders
3
Number of Cylinders
6
Power kW
74 - 85 kW
Power kW
247 - 297 kW
Engine capacity
998 cm3
Engine capacity
2,989 - 2,999 cm3

General
Model Year
2025
Model Year
2026
CO2 Efficiency Class
D
CO2 Efficiency Class
G
Brand
Kia
Brand
Mercedes-Benz
Is the Kia Stonic offered with different drivetrains?

The Kia Stonic is offered with 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.