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Audi A6 Avant vs Mercedes SL Class comparison

Compare performance (367 HP vs 816 HP), boot space and price (49,700 £ vs 112,700 £ ) at a glance. Find out which car is the better choice for you – Audi A6 Avant or Mercedes SL Class?

Audi A6 Avant vs Mercedes SL Class: Key differences

Audi A6 Avant

  • substantially cheaper
  • considerably more efficient
  • substantially more electric range

Mercedes SL Class

  • substantially more power
  • considerably quicker 0–100 km/h
  • marginally lighter

By Achim Sedelmaier

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

A6 Avant

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.

Audi A6 Avant is substantially cheaper – starting at 49,700 £ , while the Mercedes SL Class costs 112,700 £ . That’s a price difference of around 62,990 £.

Fuel consumption also shows a difference: the Audi A6 Avant uses 2.3 L/100km and is considerably more efficient than the Mercedes SL Class with 9 L/100km. The difference is about 6.7 L/100km.

As for electric range, the Audi A6 Avant offers substantially more range – reaching up to 101 km, about 89 km more than the Mercedes SL Class.

SL Class

Engine and Performance:

Under the bonnet, it becomes clear which model is tuned for sportiness and which one takes the lead when you hit the accelerator.

When it comes to engine power, the Mercedes SL Class offers substantially more power – delivering 816 HP compared to 367 HP. That’s roughly 449 HP more horsepower.

When accelerating from 0 to 100 km/h, the Mercedes SL Class is considerably quicker – completing the sprint in 2.9 s, while the Audi A6 Avant takes 4.7 s. That’s about 1.8 s quicker.

There’s also a difference in torque: the Mercedes SL Class delivers substantially more torque with 1,420 Nm compared to 580 Nm. That’s about 840 Nm more.

A6 Avant

Space and Everyday Use:

Whether family car or daily driver – which one offers more room, flexibility and comfort?

Seats: Audi A6 Avant offers more seats – 5 vs 4.

In terms of curb weight, Mercedes SL Class is marginally lighter – 1,810 kg compared to 1,865 kg. The difference is around 55 kg.

When it comes to payload, the Audi A6 Avant carries noticeably more – 570 kg compared to 375 kg. That’s a difference of about 195 kg.

Who wins the race in the data check?

The Audi A6 Avant 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 £49,700
A6 Avant

Audi A6 Avant

  • Engine Type : Petrol, Petrol MHEV, Diesel MHEV, Plugin Hybrid
  • Transmission : Automatic
  • Drive Type : Front-Wheel Drive, All-Wheel Drive
  • Power HP : 204 - 367 HP
  • Consumption L/100km : 2.3 - 7.5 L/100km
  • Electric Range : 94 - 101 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 Avant

The Audi A6 Avant wraps executive poise and usable practicality into an impeccably finished estate that makes everyday driving feel noticeably more grown-up. It serves up a calm, composed ride and clever packaging for buyers who want space and refinement without ostentation — the sensible choice that still manages to impress.

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Mercedes SL Class

The Mercedes SL blends timeless elegance with a cheeky sense of occasion, its retractable roof turning any commute into a small celebratory parade. Behind the wheel it behaves like a grown-up sports car that prefers comfort and presence over headline-grabbing bravado, making it a tempting choice for buyers who want to arrive in style.

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Audi A6 Avant
Mercedes SL Class

Costs and Consumption
Price
49,700 - 70,200 £
Price
112,700 - 219,300 £
Consumption L/100km
2.3 - 7.5 L/100km
Consumption L/100km
9 - 13.6 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
94 - 101 km
Electric Range
12 km
Battery Capacity
-
Battery Capacity
-
co2
53 - 170 g/km
co2
206 - 309 g/km
Fuel tank capacity
56 - 60 L
Fuel tank capacity
-

Dimensions and Body
Body Type
Estate
Body Type
Roadster
Seats
5
Seats
4
Doors
5
Doors
-
Curb weight
1,865 - 2,240 kg
Curb weight
1,810 - 2,195 kg
Trunk capacity
404 - 503 L
Trunk capacity
-
Length
4,999 mm
Length
-
Width
1,875 mm
Width
1,915 mm
Height
1,472 mm
Height
-
Max trunk capacity
1,497 - 1,534 L
Max trunk capacity
-
Payload
535 - 570 kg
Payload
145 - 375 kg

Engine and Performance
Engine Type
Petrol, Petrol MHEV, Diesel MHEV, Plugin Hybrid
Engine Type
Petrol MHEV, Petrol, Plugin Hybrid
Transmission
Automatic
Transmission
Automatic
Transmission Detail
Dual-Clutch Automatic
Transmission Detail
Automatic Gearbox
Drive Type
Front-Wheel Drive, All-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
204 - 367 HP
Power HP
381 - 816 HP
Acceleration 0-100km/h
4.7 - 8.3 s
Acceleration 0-100km/h
2.9 - 4.9 s
Max Speed
238 - 250 km/h
Max Speed
-
Torque
340 - 580 Nm
Torque
480 - 1,420 Nm
Number of Cylinders
4 - 6
Number of Cylinders
4 - 8
Power kW
150 - 270 kW
Power kW
280 - 600 kW
Engine capacity
1,968 - 2,995 cm3
Engine capacity
1,991 - 3,982 cm3

General
Model Year
2,025
Model Year
2,025
CO2 Efficiency Class
F, D, E, B
CO2 Efficiency Class
G
Brand
Audi
Brand
Mercedes-Benz
Is the Audi A6 Avant offered with different drivetrains?

The Audi A6 Avant is offered with 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.