Audi S7 Sportback review

Ironically, the new but out-of-favour diesel is much more efficient than the petrol V8 it replaces. Driving through a seven-speed gearbox, the 4.0-litre TFSI engine made more power (444bhp) but less torque (405lb ft). True, the old S6 could beat the latest car’s 0-62mph time (5.1 sec) by half a second and easily match its governed top speed of 155mph. But it also uses much more fuel and creates more CO2. Audi’s efficiency claims for the new unit are real enough; it’s whether the ‘dieselness’ attracts buyers that looks like being the burning issue.

For obvious reasons, there are clear similarities between S6 and S7. In a way, it’s easier to cite the differences. One is access – the S7 is lower and a little harder to get into and out of. It has a convenient boot, though; golfers will rate its big, powered liftback, which provides access to a vast carrying pace.

Behind the wheel you sit a little lower, but the similarities of the controls and fascia layout are powerful. There’s that same element of surprise when you start the engine: we’re convinced the sound and low-end strength will sell the car to some customers. The low-revs smoothness and strength is a feature we know we’d enjoy with every driven mile, and the engine flexibility is very impressive. Despite the lag-limiting compressor, the throttle response isn’t quite instant – often it’s the eight-speed gearbox sorting ratios that provides a minor delay – but old-school turbo lag is entirely absent.

One notable difference between S6 and S7 – if you, as we did, get the chance to drive the cars together – is that the fastback’s default suspension rates seem a little firmer, which was the case in the previous models. This controls roll a shade better, but the S7 has the same detectable nose-heaviness in hard cornering as its sibling. The steering’s decent, but this isn’t the best balanced big car we’ve ever driven. The ride is composed (insofar as you can make a judgment for the UK on the perfect roads of Germany) and even on 20in wheels the car seems quiet over bumps.

The same caveats apply as to the S6: if you’re not disturbed by the fact that this is a TDI (and there’s no practical or even theoretical reason why you should be), then it’s a good choice. Other cars feel more alive when cornering, but you won’t beat this one for quality or engine note. And for a big and fast car, its economy and touring range are exemplary. The Audi S7 Sportback is a good option, but it’ll be interesting to see how many make it.