Parkers overall rating: 4.8 out of 5 4.8

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 4.9 - 6.0 mpp
Diesel engines 5.2 - 7.7 mpp
Plug-in hybrid petrol engines 30.2 - 35.2 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
Based on "Weighted" mpg; figures depend on the proportion of miles driven in pure electric mode and may vary widely

Fuel economy

Petrol engines 32.5 - 39.8 mpg
Diesel engines 35.8 - 52.3 mpg
Plug-in hybrid petrol engines 201.8 - 235.4 mpg
  • Entry-level diesel is the best bet
  • All claim to reach at least 40mpg, but some seem ambitious
  • Plug-in hybrid model follow later

It's worth noting that some A6 models are yet to be tested under WLTP conditions, so claimed fuel economy figures are perhaps slightly higher than they will be when the whole range has been converted. Opt for the 40 TDI engine and fuel economy will range between 54-64mpg according to Audi. The more powerful 3.0-litre V6 50 TDI model has a claimed fuel economy of around 44mpg, around what we’d expect given the performance on offer.

Moving up to the most powerful diesel S6 will bring about a penalty in running costs but it's less than you might think - Audi says 36.2mpg is possible, despite the huge performance available on tap.

The V6-powered 55 TFSI petrol engine claims to achieve 39.2mpg, and while the 45 TFSI engine doesn't seem to achieve much more at around 42mpg, we suspect the difference will be much larger; with the 55 TFSI struggling more to reach these claimed figures.

We do know that the A6 has particularly strong resale values, though, particularly if you go for one of the more popular engine and trim combinations. You’ll find Audi’s servicing and maintenance costs on par with BMW and Mercedes-Benz - in other words, fairly expensive, but with high levels of customer satisfaction.

How eco-friendly is it?

The entry-level 40 TDI Sport (below) is the cleanest engine in the range for CO2 emissions, emitting between 117-118g/km, while the Quattro version creeps up to 119g/km.

The V6-powered 50 TDI emits 145-146g/km, which is still less than the entry-level 45 TFSI petrol engine at 150-154g/km. Worst offenders here are the 55 TFSI petrol engine with 159-160g/km and the diesel S6, which puts out 164g/km.

There's a plug-in hybrid (PHEV) version badged TFSI e due in showrooms in early 2020, that will give around 30 miles of zero-emission driving - we'll bring more on that when we drive it.

Reliability record

  • Certainly looks and feels solidly built 
  • Previous models have fared well 
  • Lots of new technology

There’s a fantastic amount of tech to go wrong, and for example our testers have experienced issues with the Virtual Cockpit and Matrix LED headlights on other models. However, the former has been upgraded in recent models and is far slicker to use. However, the A6 has been recalled a couple of times so far, with issues around a towing bracket (where fitted) and the rear window. If you're looking for a used A6 then a dealer will be able to confirm whether or not the work has been undertaken.

That's all for this model, which follows the old car's reputation as one of the more reliable cars in Audi's vast range. From new, the A6 comes with a three-year, 60,000-mile warranty.

Ongoing running costs

Road tax (12 months) £155 - £490
Insurance group 30 - 47
How much is it to insure?