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Audi A6 Avant e-tron vs Mercedes-Benz EQS (2021-2025)
Selected trimperformanceChange trim437 mi · 100 kWh · £71,700
Selected trim450+ · 2021-25Change trim453 mi · 115 kWh · £99,995
At a glance
In this comparison, Audi A6 Avant e-tron leads on motorway range, charging speed and running costs, while the Mercedes-Benz EQS stays competitive across the board.
Which should you choose?
Choose the Audi A6 Avant e-tron if...
- you do long motorway journeys - it has the best estimated real-world range at speed
- you need the fastest charging of these options
- you want the lowest running costs - from just 1.9p per mile on off-peak electricity
How we reached the recommendation
Verdict
Our take
The Audi A6 Avant e-tron leads in the most categories, but each car here has its strengths.
Value
Audi
6.4
Mercedes-Benz
6.3
Too close to call
Motorway RangeAudi
Audi
8.9
Mercedes-Benz
7.6
Family
Audi
7.8
Mercedes-Benz
8.1
Too close to call
ChargingAudi
Audi
4.7
Mercedes-Benz
3.5
Cost Per MileAudi
Audi
7
Mercedes-Benz
4.4
What each car does better
See the specification differences behind the verdict, with supporting figures for each advantage.
Audi A6 Avant e-tron
performance
- £28,295 cheaper
- 70 kW faster rapid charging
- 10 min quicker 10-80% rapid charge
- 35 kW more power
- 1.7s quicker 0-62 mph
Mercedes-Benz EQS
450+
- 108 litres more boot space
- 1.4 m tighter turning circle
- 2 more years of battery warranty
Key specifications
Compare the key specifications for your selected trims.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| Price | £71,700 (better) | £99,995 |
| Official range | 437 miles | 453 miles (better) |
| Boot space | 502 L | 610 L (better) |
| 10-80% rapid charge | 21 min (better) | 31 min |
| 0-62 mph | 4.5 sec (better) | 6.2 sec |
Size Comparison
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Audi A6 Avant e-tron
Mercedes-Benz EQS
Length
Audi A6 Avant e-tron4,928mm-288mm
Mercedes-Benz EQS5,216mm
Width
Audi A6 Avant e-tron1,887mm-39mm
Mercedes-Benz EQS1,926mm
Height
Audi A6 Avant e-tron1,527mm
Mercedes-Benz EQS1,512mm-15mm
Space, size & parking
Parking & manoeuvring
Compare exterior dimensions to assess how each car fits UK parking spaces.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| Length | 4,928 mm | 5,216 mm |
| Width (mirrors folded) | 1,887 mm (better) | 1,926 mm |
| Width with mirrors out | 2,137 mm | 2,135 mm (better) |
| Height | 1,527 mm | 1,512 mm |
| Turning circle | 12.3 m | 10.9 m (better) |
| Clearance in a standard bayA standard UK parking bay is 2,400 mm wide. | 513 mm spare (better) | 474 mm spare |
People & luggage
Compare seating, child-seat mounting points, boot space and towing capacity.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| Seats | 5 | 5 |
| ISOFIX child-seat points | Not available | 2 |
| Boot space (seats up) | 502 L | 610 L (better) |
| Boot space (seats down) | 1422 L | 1770 L (better) |
| Frunk | 27 L | Not available |
| Towing capacity (braked) | Not available | 750 kg |
How each stacks up
Percentile ranks against UK EVs of the same body style.
Audi A6 Avant e-tron
Not enough peers to make confident percentile claims.
Mercedes-Benz EQS
- 3rd-largest boot among saloon EVs in our catalogue at 610 L.
- 453 mile WLTP range, longer than 85% of saloon EVs we track.
- At 5,216 mm, longer than 90% of saloon EVs we track.
Full specifications
| Specification |  Audi A6 Avant e-tron performance |  Mercedes-Benz EQS 450+ |
|---|---|---|
| Dimensions | ||
| Length | 4.93m | 5.22m+288mm |
| Width | 1.89m | 1.93m+39mm |
| Width (mirrors) | 2.14m | 2.13m-2mm |
| Height | 1.53m | 1.51m-15mm |
| Wheelbase | 2.95m | 3.21m+264mm |
| Ground Clearance | Not available | 143mm |
| Capacity | ||
| Boot (seats up) | 502L | 610L (better) |
| Boot (seats down) | 1422L | 1770L (better) |
| Frunk | 27L | Not available |
| Seats | 5 | 5 |
| Practicality | ||
| Turning Circle | 12.3m | 10.9m (better) |
| Kerb Weight | 2,260kg (better) | 2,480kg |
| Towing Capacity | Not available | 750kg |
| Electric | ||
| Battery | 100kWh | 115kWh (better) |
| Range (WLTP) | 437 mi | 453 mi (better) |
| Max DC Charge | 270kW (better) | 200kW |
| Pricing | ||
| UK MSRP | £71,700 (better) | £99,995 |
| Details | ||
| Body Style | Estate | Saloon |
| Available | 2024+ | 2021–2025 |
Range & charging
Range, charging & battery
Check official and estimated driving range alongside charging speeds, efficiency and battery technology.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| Official range (WLTP) | 437 miles | 453 miles (better) |
| Estimated motorway rangeEVcarsguide estimate at sustained motorway speed. | 364 miles | 378 miles (better) |
| 10-80% rapid charge time | 21 min (better) | 31 min |
| Max rapid charge rate | 270 kW (better) | 200 kW |
| Home AC charging | 11 kW | 11 kW |
| Usable battery capacity | 94.9 kWh | 107.8 kWh (better) |
| Battery chemistry | NMC | NMC |
| Battery architecture | 800V (better) | 400V |
| Heat pump | Not available | Not standard |
Driving & everyday use
Performance & drivetrain
Compare acceleration, power and drivetrain specifications for the selected trims.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| 0-62 mph | 4.5 sec (better) | 6.2 sec |
| Power | 280 kW (better) | 245 kW |
| Torque | 565 Nm | 568 Nm (better) |
| Drivetrain | RWD | RWD |
What the critics say
See how UK motoring publications rate each car in their road tests. One car has more review coverage than the other - we show that rather than guessing.
Audi A6 Avant e-tron
performance
No critic reviews gathered yet for this car.
Mercedes-Benz EQS
450+
Watch the reviews
Watch selected video reviews here, or visit each model page for the full collection.
Audi A6 Avant e-tron
All 3 videos
Reviews and videos discuss each model overall; the specifications above apply to your selected trims.
Prices & deals
Calculate your real costs
For a useful running-cost comparison, factor in your mileage, charging access and current petrol or diesel car alongside the EV estimate.
Compare with petrol or diesel
Compare purchase price, energy, road tax and maintenance with a petrol or diesel alternative.
Calculate company-car tax
Work out monthly Benefit-in-Kind using current and future HMRC rates.
Cost per mile
Compare EV charging costs per mile with petrol and diesel using your charging options.
Check a lease quote
Assess the effective monthly cost alongside the list price and expected depreciation.
Safety & ownership confidence
Euro NCAP - Audi A6 Avant e-tron performance
Tested 2025
Adult Occupant92%
Child Occupant91%
Safety Assist80%
Full result on euroncap.com (opens in new tab)
Euro NCAP - Mercedes-Benz EQS 450+
Tested 2021
Adult Occupant96%
Child Occupant91%
Vulnerable Road Users76%
Safety Assist80%
Warranty
Check the published battery warranty cover for each selected trim.
| Measure | Audi A6 Avant e-tronperformance | Mercedes-Benz EQS450+ |
|---|---|---|
| Battery warranty | 8 years | 10 years (better) |
| Battery warranty distance | 160,934 km | 250,000 km (better) |
Buying options
Get a quote
Audi A6 Avant e-tron
Used on AutoTraderLease deals
Mercedes-Benz EQS
Used on AutoTraderLease deals
Live used listings
Active inventory from independent UK dealers.
Audi A6 Avant e-tron
No active listings.
Mercedes-Benz EQS
- £40,9902022Cars2View
Frequently asked questions
Is the Mercedes-Benz EQS worth the extra £28,295 over the Audi A6 Avant e-tron?
The Mercedes-Benz EQS costs £28,295 more than the Audi A6 Avant e-tron. For that premium it adds 108 litres more boot space. The Audi A6 Avant e-tron is not just cheaper - it also offers 70 kW faster peak rapid charging, 35 kW more power and a 1.7s quicker 0-62mph time. On EVcarsguide's combined category scores, the Audi A6 Avant e-tron comes out ahead overall.
Which is cheaper to own over 5 years, the Audi A6 Avant e-tron or the Mercedes-Benz EQS?
The Audi A6 Avant e-tron is £28,295 cheaper to buy. Running costs are almost identical - about £152 a year either way, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the Audi A6 Avant e-tron comes out roughly £28,415 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.
What are the Audi A6 Avant e-tron and Mercedes-Benz EQS like on a long motorway trip?
EVcarsguide estimates a real-world motorway range of about 364 miles for the Audi A6 Avant e-tron and 378 miles for the Mercedes-Benz EQS - effectively matched, and both well below their WLTP figures because sustained high speed is the hardest case for an EV. A rapid charge to 80% takes around 21 minutes in the Audi A6 Avant e-tron and 31 in the Mercedes-Benz EQS, so the Audi A6 Avant e-tron loses less time at each stop.
Which is easier to park and drive in town, the Audi A6 Avant e-tron or the Mercedes-Benz EQS?
The Audi A6 Avant e-tron is the easier car for tight UK car parks: it is 39 mm narrower than the Mercedes-Benz EQS. In a standard 2,400 mm bay that leaves about 513 mm of total clearance for the Audi A6 Avant e-tron and about 474 mm of total clearance for the Mercedes-Benz EQS. The Mercedes-Benz EQS also turns in a 1.4 m tighter circle, which helps with U-turns and multi-storey ramps.
Which battery will hold up better as a used buy, the Audi A6 Avant e-tron or the Mercedes-Benz EQS?
Over a 8-year ownership window EVcarsguide's degradation model projects roughly 84% battery health for the Audi A6 Avant e-tron and 84% for the Mercedes-Benz EQS. That is close enough that capacity loss should not decide between them. Both use NMC-type cells, so for daily use keep the charge limit near 80% to slow degradation. The Mercedes-Benz EQS has the longer battery warranty at 10 years, versus 8 for the Audi A6 Avant e-tron.
Go deeper on each car
Visit the full model pages for owner feedback, expert reviews, used prices and battery-health information.
Compare against other rivals
Compare similarly sized and priced electric cars before finalising your shortlist.
More Audi A6 Avant e-tron comparisons
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See both cars in our rankings
EVcarsguide scores every verified EV on price, range, family use and running costs. Here is where this pair appears.
Where the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among the best family EVsWhere the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among long-range EVsWhere the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among the best motorway EVsWhere the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among the best city EVsWhere the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among the cheapest EVs to runWhere the Audi A6 Avant e-tron and Mercedes-Benz EQS rank among EVs with the biggest boots
If neither is quite right
Explore other verified electric cars that may better suit the priorities this pair does not meet.
Further reading
Explore buying and ownership guides to help you choose between these electric cars.
GuideBuying a Used Audi A6 e-tron (2024 on): Sportback vs Avant, Versions & What to Pay
A used Audi A6 e-tron buyer’s guide: Sportback or Avant, 83 kWh vs 100 kWh performance and quattro, battery warranty, real-world range, used prices against discounted new stock and a printable checklist.
GuideBuying a Used Mercedes EQS or EQS SUV (2021 on): Versions, Recalls, Real Range & What to Pay
A used Mercedes EQS buyer’s guide: the 450+ and AMG EQS 53 saloons and the EQS SUV, the 2024 battery update, software recalls, the 10-year battery warranty, real-world range, what to pay and a printable checklist.
Data accuracy
Specs are sourced from manufacturer websites and manually reviewed. These figures were last verified .