Parkers overall rating: 4.3 out of 5 4.3

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

Petrol engines 4.3 - 5.6 mpp
Diesel engines 6.2 - 6.8 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.

Fuel economy

Petrol engines 20.2 - 26.4 mpg
Diesel engines 30.7 - 33.6 mpg
  • Reasonable claimed fuel economy
  • Servicing and parts will be pricey
  • Three-year, 60,000-mile warranty as standard

Fuel economy for the Q8 50 TDI (286hp 3.0-litre diesel) is officially 30.7-33.6mpg - which is best described as reasonable. Whereas the Q8 55 TFSI ranges from 25.4mpg to 26.4mpg. Once again, not bad for a petrol engine, but not earth shatteringly economical.

Insurance and servicing will be at the upper end of the scale, while depreciation is likely to be steep, yet nevertheless competitive with the Q8’s rivals.

  • No confirmed hybrid version as of yet
  • All cars do come with mild-hybrid tech, however…
  • …helping to save fuel and reduce emissions

Much like the fuel economy figures, the CO2 emissions for the Q8 aren't remarkable. The 50TDI diesel claims 228g/km, while the 55 TFSI produces 250g/km.

SQ8 and RS Q8 more costly to run

Although it's not a fuel-sipping low-emission special, the SQ8 has a diesel engine and therefore offers a modicum of sensibility when it comes to fuel economy.

Audi promises 31-31.4mpg and between 239-235g/km of CO2 - significantly better than the petrol RS Q8 but lagging way behind less powerful diesel options.

The clever 48v mild-hybrid system should save a bit of fuel but in reality it has been deployed in this context to boost performance and handling, rather than range.

The RS Q8 uses the same mild-hybrid system. Essentially, when the driver takes their foot off the accelerator between 34mph and 99mph, the car's computer decides how best to recuperate, depending on what mode you're in. It can coast for 40 seconds with engine off. The big V8 engine also has Audi's cylinder on demand system: at low to medium throttle input in high gears, it can turn off cylinders 2,3,5 and 8. The cylinders reactivate when the driver presses the accelerator.

When pushed, it can definitely still get into single figure mpg. On our test route, admittedly at altitude, we saw as low as 9mpg. Officially, MPG is 20.5mpg on the 22-inch alloys, while the CO2 figures start from 277g/km. We'd expect somewhere between 10 and 20mpg on regular driving routes.

Reliability

  • Brand-new model featuring the latest tech
  • Based on the Q7 platform and uses tried and tested mechanicals
  • The vehicle’s complexity means there’s plenty to go wrong, however

Sharing a platform with the Q7, the Q8 uses many tried-and-tested Audi parts that have proven reliable over the years. However, there has been reported issues with the Q7’s Virtual Cockpit system and Matrix LED headlights. The Q7 has also been subject to four official DVSA recalls.

Just bear in mind that with such a vast array of complicated systems onboard, the Q8 will always have the potential for issues.

Audi S Q8 (2020) boot badge

Ongoing running costs

Road tax (12 months) £475
Insurance group 47 - 50
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