Audi A8 review - MPG, CO2 and running costs

The 48-volt mild hybrid system in the Audi A8 helps to deliver respectable fuel economy figures (under WLTP testing), with the 50 TDI delivering 40.4mpg when using the standard-fit 18-inch alloy wheels. But, opt for the 20-inch rims that come with the Black Edition trim and economy drops to 39.2mpg. The 55 TFSI Sport petrol model delivers up to 31mpg on the combined cycle.

The choice of equipment level also has an impact on CO2 emissions, with 50 TDI emitting between 184-189g/km of CO2, while the figures are 206g/km to 211g/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 around 148mpg (as long as you keep the battery topped up), with CO2 emissions from 42g/km.

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.

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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 36 per cent of its value after three years and 36,000 miles, with the A8 L losing a touch more than the standard wheelbase car. The S8 performance model does slightly better, holding on to 47 per cent of its original list price after the three-year period of ownership.