The entry-level TFSI 40 petrol engine is the cheapest to buy, but with a claimed economy figure of 37.7mpg, it could soon prove rather costly at the pumps. The more powerful TFSI 45 fares slightly worse, at 36.2mpg.

Predictably, the 40 TDI diesel engine offers better, but still pretty average, fuel economy, delivering up to 48.7mpg on the WLTP combined cycle. Official CO2 emissions start from 151g/km

Fuel efficiency is boosted thanks to the Audi A6 Avant’s mild-hybrid system, which recovers energy during braking and enables engine-off coasting at speeds of between 34mph and 99mph.

If you want the best economy, though, the plug-in hybrid 50 TFSI e model is the one to go for. Not only does this powertrain significantly boost the A6 Avant’s economy, but the lower emissions and fully-electric driving capability make it the cleanest variant, meaning it is the best option for those seeking a company car.

The official WLTP combined cycle figure stands at 188.3mpg. However, it’ll be very difficult to achieve this in the real world. When we tested the Audi A6 TFSI e, we achieved 60mpg with ease, outperforming the diesel version when it comes to thirst. Recharging the 50 TFSI e fully takes around 2.5 hours using a 7.4kW home wallbox charger.

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2018 Audi

145,573 milesManualDiesel2.0L

Cash £6,650

View A6

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2021 Audi

40,485 milesAutomaticDiesel2.0L

Cash £18,999

View A6

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2021 Audi

51,150 milesAutomaticPetrol2.0L

Cash £21,195

View A6

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2021 Audi

31,750 milesAutomaticPetrol2.0L

Cash £24,495

View A6

While we doubt that those looking at the S6 and RS 6 performance models are too fussed about efficiency, the diesel-powered S6 will return up a very reasonable 39.2mpg. The RS 6’s thundering V8, however, will just about scrape up to 23mpg.

Insurance groups

The 40 TFSI in Sport trim is the cheapest A6 Avant to insure, slotting into insurance group 33E. There’s no premium penalty for upgrading to the Technology Pack, but the S line model is slightly more expensive, sitting in group 36E of 50. The letter ‘E’ denotes that this Audi has exceeded the security requirements of its respective group.

You’ll pay more to insure the plug-in hybrid TFSI e models, as all trim levels sit in group 43E. In all cases, the A6 Avant is more expensive to insure than the BMW 5 Series Touring, which resides in groups 29E to 39E.

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Depreciation

The A6 Avant has the edge over its saloon sibling when it comes to residual values. Our expert data predicts that the Avant will retain 40-47 per cent of its initial value after three years/36,000-miles. This is an average performance, but the saloon fares worse at a rate of just 30-41 per cent.

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Cheapest

Name
2.0 TFSI 204 Sport 5dr S Tronic
Gearbox type
Semi-auto
RRP
£53,930

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Most Economical

Name
2.0 e-Hybrid Quattro 299 Sport 5dr S Tronic
Gearbox type
Semi-auto
RRP
£64,190

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Fastest

Name
2.0 e-Hybrid Quattro 299 Sport 5dr S Tronic
Gearbox type
Semi-auto
RRP
£64,190

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In This Review

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Shane Wilkinson

Shane is responsible for looking after the day-to-day running of the Auto Express website and social media channels. Prior to joining Auto Express in 2021, he worked as a radio producer and presenter for outlets such as the BBC.