In-depth reviews

Audi A8 review - MPG, CO2 and running costs

Hybrid systems deliver respectable economy, but depreciation remains a big problem for the A8

The 48-volt mild hybrid system in the Audi A8 helps to deliver respectable fuel economy figures (under tougher WLTP testing), with the 50 TDI delivering 40.9mpg when using the standard-fit 18-inch alloy wheels. But, opt for the 21-inch rims that come with the Vorsprung trim and economy drops to 38.2mpg. 

In the 55 TFSI model, you can expect up to 29.4mpg on a combined cycle, which again drops to 28.2mpg in top Vorsprung trim. The choice of equipment level also has an impact on CO2 emissions, with 50 TDI emitting between 181-197g/km of CO2. The figures are 217g/km to 232g/km for the 55 TFSI. 

The 60 TFSI e plug-in hybrid is the greenest choice by far. The petrol/electric model has a claimed maximum economy of 113mpg, with emissions of between 58g/km and 65g/km of CO2.

Insurance groups

As with all cars as expensive and swift as the A8, insurance is pricey. The 55 TFSI and 50 TDI start from group 44 out of 50, while the 60 TFSI e will attract a more expensive premium being in group 48 for the standard car and group 49 for the long-wheelbase version. The top-of-the-range S8 predictably sits in group 50.

Depreciation

As with all limousines, the Audi A8 loses a hefty chunk of cash to depreciation. Our experts predict that the range will retain an average of 37% of its value after three years and 36,000 miles, with the A8 L losing a touch more than the standard wheelbase car. The best performer in terms of retaining value is the 60 TFSI e model which is able to hold on to 47% of its original list price.

Which Is Best

Cheapest

  • Name
    50 TDI Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £71,745

Most Economical

  • Name
    50 TDI Quattro Sport 4dr Tiptronic
  • Gearbox type
    Semi-auto
  • Price
    £71,745

Fastest

  • Name
    55 TFSI Quattro Sport 4dr Tiptronic [C+S]
  • Gearbox type
    Semi-auto
  • Price
    £75,365

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