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Audi A6 Limousine vs Mercedes GLS comparison

Compare performance (367 HP vs 404 HP), boot space and price (47,600 £ vs 92,700 £ ) at a glance. Find out which car is the better choice for you – Audi A6 Limousine or Mercedes GLS?

Audi A6 Limousine vs Mercedes GLS: Key differences

Audi A6 Limousine

  • substantially cheaper
  • substantially more efficient
  • slightly quicker 0–100 km/h
  • visibly lighter
  • visibly more trunk space
details

Mercedes GLS

  • very slightly more power
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By Achim Sedelmaier

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

A6 Limousine

Costs and Efficiency:

Price and efficiency are often the first things buyers look at. Here it becomes clear which model has the long-term edge – whether at the pump, the plug, or in purchase price.

Audi A6 Limousine is substantially cheaper – starting at 47,600 £ , while the Mercedes GLS costs 92,700 £ . That’s a price difference of around 45,091 £.

Fuel consumption also shows a difference: the Audi A6 Limousine uses 2.2 L/100km and is substantially more efficient than the Mercedes GLS with 7.9 L/100km. The difference is about 5.7 L/100km.

GLS

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Mercedes GLS offers very slightly more power – delivering 404 HP compared to 367 HP. That’s roughly 37 HP more horsepower.

When accelerating from 0 to 100 km/h, the Audi A6 Limousine is slightly quicker – completing the sprint in 4.7 s, while the Mercedes GLS takes 5.6 s. That’s about 0.9 s quicker.

There’s also a difference in torque: the Mercedes GLS delivers clearly more torque with 750 Nm compared to 580 Nm. That’s about 170 Nm more.

A6 Limousine

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, Audi A6 Limousine is visibly lighter – 1,845 kg compared to 2,580 kg. The difference is around 735 kg.

Looking at boot space, the Audi A6 Limousine offers visibly more boot space – 492 L compared to 355 L. That’s a difference of about 137 L.

When it comes to payload, the Mercedes GLS carries visibly more – 820 kg compared to 625 kg. That’s a difference of about 195 kg.

Who wins the race in the data check?

The Audi A6 Limousine 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 £47,600
A6 Limousine

Audi A6 Limousine

  • Engine Type Petrol, Diesel MHEV, Petrol MHEV, Plugin Hybrid
  • Transmission Automatic
  • Drive Type Front-Wheel Drive, All-Wheel Drive
  • Power HP 204 - 367 HP
  • Consumption L/100km 2.2 - 7.3 L/100km
  • Electric Range 97 - 105 km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

Audi A6 Limousine

The Audi A6 cuts a clean, purposeful silhouette with an interior that feels like a quiet, high-tech office on wheels—luxurious materials and clever gadgets make long journeys surprisingly pleasant. It balances composed, confident driving with enough flair to keep you entertained, making it a sensible choice for buyers who want executive polish without showing off.

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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
47,600 - 68,100 £
Price
92,700 - 104,600 £
Consumption L/100km
2.2 - 7.3 L/100km
Consumption L/100km
7.9 - 9.9 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
97 - 105 km
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
49 - 166 g/km
co2
206 - 226 g/km
Fuel tank capacity
-
Fuel tank capacity
-

Dimensions and Body
Body Type
Sedan
Body Type
SUV
Seats
5
Seats
7
Doors
-
Doors
-
Curb weight
1,845 - 2,220 kg
Curb weight
2,580 - 2,670 kg
Trunk capacity
354 - 492 L
Trunk capacity
355 L
Length
-
Length
-
Width
1,875 mm
Width
1,956 mm
Height
-
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
535 - 625 kg
Payload
810 - 820 kg

Engine and Performance
Engine Type
Petrol, Diesel MHEV, Petrol MHEV, Plugin Hybrid
Engine Type
Petrol MHEV, Diesel MHEV
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
All-Wheel Drive
Power HP
204 - 367 HP
Power HP
336 - 404 HP
Acceleration 0-100km/h
4.7 - 8.2 s
Acceleration 0-100km/h
5.6 - 6.2 s
Max Speed
-
Max Speed
-
Torque
340 - 580 Nm
Torque
560 - 750 Nm
Number of Cylinders
4 - 6
Number of Cylinders
6
Power kW
150 - 270 kW
Power kW
247 - 297 kW
Engine capacity
1,968 - 2,995 cm3
Engine capacity
2,989 - 2,999 cm3

General
Model Year
2025
Model Year
2026
CO2 Efficiency Class
F, D, E, B
CO2 Efficiency Class
G
Brand
Audi
Brand
Mercedes-Benz
What drivetrain options does the Audi A6 Limousine have?

Available configurations include Front-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.