• 35-50mpg possible
• Mild hybrid tech
• Servicing packages

What are the running costs?

The 2.0 TFSI petrol is reasonably efficient, returning around 35-40mpg in real-world conditions. The diesel stretches this to 45-50mpg, which we’re matching in our long-term test, making it the better bet for long-distance drivers, although not necessarily on a cost basis as diesel is slightly more expensive at the pumps and you do need to top it up with AdBlue.

The CO2 emissions range from 135-181g/km depending on engine and trim, meaning company car tax is on the higher side for now. Expect better numbers when plug-in hybrids arrive. Insurance falls into group 34 or above, and servicing costs will be on the premium side. But you can offset some of this with Audi’s fixed-price servicing plans (see below).

Servicing and warranty

The A6 Avant comes with Audi’s standard three-year, 60,000-mile warranty. There’s also a 12-year anti-corrosion and three-year paint warranty. Audi’s dealer network is widespread and well regarded, offering fixed-price servicing and maintenance plans. Extended warranties are also available if you want extra peace of mind.

When plug-in hybrids arrive, expect the usual eight-year battery warranty and dedicated servicing support.

Reliability

The A6 Avant uses tried-and-tested VW Group mechanicals but mounted on a new platform, so it’s too early to get a reliable impression. However, the early signs suggest it should be reliable. Most major components are shared with other large Audis and VW models.

However, the digital features and twin-screen systems add some complexity, and a few owners have reported glitches, and we’ve had issues with our closely-related A5 Avant in an extended ownership period. It’s worth checking forums or Parkers Owner Reviews to get a feel for real-world dependability.

Overall, the jury’s out, so do consider extended warranty cover if you’re planning to keep the car long-term