Audi A8: Packing Performance 09 September 2014 by Kieren Puffett Audi A8 boasts a 4.2-litre V8 Turbo diesel engine Pulling power is an incredible 850Nm of torque That means a 0-60 sprint in just 4.5 seconds Enlarge 5 photos Main image caption The Audi A8 It’s impossible not to notice just how powerful our new addition to the fleet is. This Audi A8 packs a bicep-popping 4.2-litre V8 turbo diesel engine that has more pulling power than a ploughing contest. It’s the reason why the A8 is so quick off the line and manages to sprint to 60mph from rest in just 4.5 seconds. That ability is usually the reserve of Ferraris and Lamborghinis. Supercar beating performance In fact, Porsche’s entry-level 911 Carrera 2 manages the same challenge in 4.6 seconds so marginally slower than a car designed to transport four adults in sumptuous luxury! While all this power is fantastic for traffic light drag racing it’s not much use if it has the passengers pitching around like a bunch of drunks. The German company has teamed the big diesel up with an eight-speed automatic (dubbed Tip Tronic) that can handle the enormous shove of the V8. Smooth gear changes Not only that but the transition between the gears is so smooth that you're really only aware of any cog swapping going on because there is either a change in engine note or the gear selection indicator changes number. This is the fine art of wafting passengers in luxury surroundings mixed with supercar performance. You would think that given this ability for speed that fuel economy would be a painful reminder every time you pull up to a pump. Certainly I am forking out around a ton every time I fill the tank but the engine can turn its hand to economical motoring. The claimed official average fuel consumption is 31mpg and I found that normal commuting and bit of longer-distance driving results in an indicated 28-29mpg – not bad. Fuel economy can impress It was during a fairly marathon drive (lasting nearly eight hours in total) that the A8 turned in a very surprising result when it came to sipping fuel. The on-board computer ended on 35.7mpg as the final tally for the journey and I had seen it up as high as 37mpg. Given the starting price of the A8 is over £70k, you’d think that fuel costs aren’t really going to be a major concern. Even so at that average mpg that means a tank range of just over 500 miles. That is a cost per mile of 20p given a £100 fill-up, which means you can spare some cash to keep the fridge (optional extra) stocked with Bollinger for your rear passengers. Mileage: 2,421 Fuel economy: 35.7mpg Advertisement The Audi A8 The Audi A8 is capable of 37mpg. The Audi A8 The A8's powerful V8. The Audi A8's automatic gearbox changes gear almost seamlessly.