In-depth reviews

Audi A8 saloon - MPG, running costs & CO2

Impressive fuel economy is by far the easiest of the A8's running costs to swallow

Carbuyer Rating

4.3 out of 5

Owners Rating

3.2 out of 5

Read owner reviews
MPG, running costs & CO2 Rating

3.0 out of 5

The Audi A8 is likely to prove expensive to run – the same is true of any luxury saloon in this part of the market. On the plus side, its fuel economy impresses for a car of this size, and the plug-in hybrid version will further reduce fuel consumption. However, keeping a car like this on the road doesn't come cheap.

Audi A8 MPG & CO2

It's disappointing, although perhaps inevitable, that the latest A8 should be heavier than its predecessor. Many weight-saving strategies were employed in its design and construction, including high-strength steel, carbon-fibre and magnesium components.

However, all its technology and equipment takes its toll and the A8 has put on up to 95kg in the metamorphosis into its current form. Despite this, though, fuel economy is definitely a strong suit, and Audi claims that up to 40.9mpg is possible in 282bhp 50 TDI form. We came close to achieving this result during our time behind the wheel. CO2 emissions of 193g/km attract the highest Benefit-in-Kind (BiK) tax for company-car users.

Another engine offered from the beginning is a 3.0-litre petrol 55 TFSI. This is claimed to return 29.4mpg, with emissions of 228g/km for the highest BiK rating. These figures apply to the entry-level 18-inch wheels – the larger 19 and 20-inch options bring an increase in emissions and a reduction in fuel economy.

Badged A8 60 TFSI e, the plug-in hybrid uses a V6 petrol but it’s paired with an electric motor and 14.1kWh lithium-ion battery pack. This provides an all-electric driving range of up to 29 miles, making it possible for many short trips to be completed with hardly any petrol at all. The facelifted model gets a slightly bigger battery so we’d expect the electric range to increase, but an actual figure is yet to be confirmed.

It can also be driven in hybrid mode, and when using navigation the car's computers will even work out the best power source to use along your route. Charging the battery pack takes around 2.5 hours using a 7kW wallbox and road tax is reduced by £10 a year. The 60 TFSIe plug-in hybrid returns a claimed combined fuel economy of 113mpg and CO2 emissions of 65g/km. For company-car drivers, that means a BiK rate roughly two-thirds lower than the petrol or diesel versions.

Insurance

The 3.0-litre Audi A8s, both petrol and diesel, sit in group 44 out of 50, so insurance premiums aren’t likely to be cheap. It’s group 48 for the plug-in hybrid, and the highest 50 rating for the S8.

Servicing

Audi cars are maintained according to a choice of fixed or flexible service schedules. Fixed is intended for those who cover less than 10,000 miles a year or who make mainly short urban journeys. Under this scheme, a car requires an oil-change service every year or 9,000 miles and an inspection service every two years or 19,000 miles.

Those who cover in excess of 10,000 miles a year are advised to follow the flexible schedule, under which an oil service is performed every two years or 19,000 miles (whichever comes first), with an inspection service set at the same interval as with the fixed schedule.

In order to keep abreast of maintenance, it's a good idea for A8 owners to take advantage of one of Audi's service pre-paid plans.

Warranty

The Audi A8 is covered by the same three-year warranty as other Audi models. This has no mileage limit in the first two years, but a 60,000-mile ceiling comes into effect for year three. You can extend the warranty to four years/75,000 miles or five years/90,000 miles for an extra charge.

Next Steps

Which Is Best?

Cheapest

  • Name
    50 TDI Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £72,175

Most Economical

  • Name
    60 TFSI e Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £85,975

Fastest

  • Name
    55 TFSI Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £73,800

Recommended

Audi A8 saloon review
2021 Audi A8 driving - front view
Audi A8
15 Nov 2021

Audi A8 saloon review

Most Popular

UK road tax costs 2021/2022 explained
2021 Road Tax explained
Tips and advice
7 Jan 2022

UK road tax costs 2021/2022 explained

Top 10 best economical 4x4s, SUVs and crossovers 2022
Peugeot 3008 SUV front cornering
Best cars
6 Jan 2022

Top 10 best economical 4x4s, SUVs and crossovers 2022

Best 0% APR car deals
Hyundai Bayon deals
Deals
5 Jan 2022

Best 0% APR car deals

Tips & advice

View All
Car dashboard warning lights: the complete guide
Car dashboard symbols and meanings
Tips and advice
10 Aug 2021

Car dashboard warning lights: the complete guide

Electric car charging stations: a complete guide
Electric car charging station
Tips and advice
5 Nov 2021

Electric car charging stations: a complete guide

PCP vs HP – which type of car finance is right for you?
PCP vs HP
Tips and advice
29 Sep 2021

PCP vs HP – which type of car finance is right for you?

Average speed cameras: how do they work?
Average speed cameras: how do they work?
Tips and advice
23 Jul 2021

Average speed cameras: how do they work?

Best cars

View All
Top 10 best car interiors 2022
Peugeot 208 hatchback
Best cars
25 Jun 2021

Top 10 best car interiors 2022

Top 10 best electric cars 2022
Ioniq 5
Best cars
1 Dec 2021

Top 10 best electric cars 2022

Top 10 best cheap-to-run cars 2022
Toyota Prius front 3/4 cornering
Best cars
17 Jan 2022

Top 10 best cheap-to-run cars 2022

The UK's top 10 fastest hot hatchbacks 2022
Audi RS 3 driving - front view
Hot hatches
27 Oct 2021

The UK's top 10 fastest hot hatchbacks 2022