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Audi A6 TFSIe long-term test | long-distance mpg impresses

8 Audi A6 TFSIe long-term test review
BIK List Price
Audi A6 BIK list price
BIK Percentage
Audi A6 BIK Percent
Audi A6 CO2
Combined MPG
176.6 (WLTP)
Audi A6 MPG


An essential work trip gave me the reason to leave my home town for what seems like the first time in six months and to take the Audi A6 on its longest journey since joining our long-term fleet.

I already knew the A6 provides exceptional levels of refinement and comfort and the 99 miles from my Norfolk home to Coventry reinforced that.

What did come as a surprise was just how efficient the plug-in hybrid powertrain was. It uses a 252PS 2.0 TFSI petrol engine combined with an electric motor to produce a combined 299PS.

Its 14.1kWh battery provides an electric-only range of up to 34 miles, but the car also lets you select auto hybrid mode, where it will alternate between battery and petrol or use both at the same time dependent on speed, style of driving and battery charge. With the car in auto mode and a fully-charged battery, it achieved an average fuel economy of 48.9mpg for the outward trip.

The journey home, which started with no battery charge, saw an efficiency of 40.2mpg, pretty good for a two-tonne executive saloon powered mainly by its 2.0-litre engine.

Does the cold weather affect EV range?

Early findings from the ongoing Optimus Prime electric vehicle trial note that the range of their battery electric vehicles falls by around 20% when the temperature drops in the winter, and my experience is similar.

When it’s warm, the projected electric range of our Audi A6 50 TFSI plug-in hybrid is 34 miles when fully charged. So far this winter, it has typically dropped to 28 miles, although on one particularly cold morning it fell to 22.

This is not a disaster because the A6 switches to its petrol engine when the charge runs out, but I was surprised what a difference the cold weather had made.

That day when it fell to 22 miles was also the day when I was making a 90-mile round-trip – the longest journey I’ve made since getting the keys to the car.

On the outward journey, the final 23 miles were on petrol only and I recorded fuel economy of 45.7mpg.

The plan was to use the return trip to get an idea of the car’s fuel economy on petrol alone, but when I returned to the A6 after a couple of hours the battery had somehow – possibly because the day had warmed up – recovered six miles of range.

This meant I couldn’t carry out this efficiency test and the subsequent Covid-19 lockdown has prevented me from doing any journeys long enough to do this since.

Other than the reduced electric range, the A6 has been a great cold weather companion.

As it’s a PHEV, the MyAudi app allows you to determine how the interior should be heated or cooled while the vehicle is being charged, ensuring it’s nice and toasty when you get in, as well as de-icing the windows.

This function allows you to set the climate control as well as the heated seats, rear windscreen and mirrors.

On top of that, the A6 also has Audi’s quattro four-wheel drive system to provide extra traction, ensuring my time with the car continues to be a really enjoyable one.

Plugging-in enables majority of journeys on electric

One of the few unknowns when I was handed the keys to our Audi A6 long-termer was how well its plug-in hybrid technology would fit into my lifestyle: the answer to this has been ‘very well’.

I currently work from home instead of doing a 75-mile round trip to the office each day. This has meant the A6’s official electric-only range of 34 miles has allowed me to do perhaps 95% of my journeys without burning a drop of petrol.

I’m also fortunate enough to have a 7kW Pod Point charger at home, which – combined with the A6’s 7kW on-board charger – can charge the 14.1kWh battery from empty to full in around two hours.

The PHEV powertrain has also changed my shopping habits. I worked part-time at Tesco when I was in sixth form and have remained loyal since.

It turns out, however, my loyalty can be bought and all it has taken is enough free electricity to drive 12 miles. That’s how much charge I can put into the A6 when I shop at my local Sainsbury’s. As, ironically, Tesco says, every little helps.

Audi A6 TFSIe plug-in hybrid joins our fleet

A new long-term test car day is always an exciting event and my most recent changeover was a more anticipated moment than many.

I’ve switched from Audi’s impressive A4 into its bigger executive saloon sibling, the A6, in S Line trim. The change has also seen me switch from a diesel powertrain to the TFSI e plug-in hybrid.

Combining a 2.0-litre petrol engine and a 105kW electric motor to produce 299PS, it has an official combined fuel economy of 188.3mpg with CO2 emissions of 36g/km.

This, together with an electric-only range of 34 miles from its 10.1kWh battery, puts the A6 in the 10% benefit-in-kind (BIK) tax band for 2020/21.

Its P11D price of £56,945 means a 40% taxpayer will pay monthly BIK of £190. This will increase to £209 in the 2021/22 tax year when the BIK band rises to 11%, but it still remains an awful lot of car for the money.

It’s also very well equipped in S Line trim. Standard equipment across the A6 range includes Audi’s MMI two-touchscreen infotainment system – the upper one measuring 10.1 inches – Audi’s Virtual Cockpit TFT digital instrument cluster, and integration of Amazon’s cloud-based Alexa voice control.

Audi A6 TFSIe rear

S Line also includes Matrix LED headlights, 19-inch wheels, sports suspension and sports seats.

On top of this, our test car features silver metallic paint (£685), City Assist Pack (£1,375), Comfort and Sound pack (£2,295) and electric heated and folded door mirrors (£150).

City Assist includes technologies such as blind spot assist, pre-sense in the event of a rear-end collision and cross-traffic assist, while Comfort and Sound includes systems such as 360-degree cameras, park assistant and a Bang & Olufsen sound system.

The addition of these packs may seem slightly extravagant, but they do add a lot of equipment for the cost and should enhance the ownership experience.

Early signs are very promising. Technically and aesthetically the A6 is an impressive package, and my time behind the wheel so far has further reinforced this: it oozes class and quality.

Hopefully, I’ll continue to enjoy it as much over the next six months as I am at the beginning.

Top Speed
Audi A6 Top Speed
VED band
Audi A6 Ved
Fuel Type
Petrol Hybrid
Audi A6 Fuel Type
Residual Value
3 Year 60k : £20,288
4 Year 80k : £16,423
Running Cost (ppm)
3 Year 60k : 76.81
4 Year 80k : 67.73

CO2 emissions and fuel consumption data correct at time of writing. The latest figures are available in the Fleet News fuel cost calculator and the company car tax calculator.

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