The A5 Cabriolet's standard seven-speed dual-clutch automatic gearbox is mostly smooth and snappy – bar the usual jerkiness at slow speeds. And if you put it in to manual mode, hold the car in third and accelerate, you’ll discover a very linear power delivery all the way from 1500rpm around to 6000rpm, when it finally starts to wane. Which also means solid if not scintillating performance, with the ability to get past lumbering lorries in the hinterland without too much stress.
So, it’s great then? Ah, no. Remember that sense of fun we targeted? Well, this is an engine completely devoid of character. Linear it may be, but there’s no exponential power explosion to encourage you to rev it to the final furlong, or indeed aural delights to stir the soul. A mildly gravelly, but mostly insipid, four-pot whimper is about your lot. That said, with its main rivals, the BMW 430i and Mercedes-Benz C 300, having just four-cylinders too, you could argue it's merely a sign of the times.
Nevertheless, it does beg the question: why choose this petrol over the silky charms and even greater frugality of the 3.0-litre TDI 218 V6 diesel? We mention this simply because the A5 Cabriolet bowls down the road with such a supple gait that the effortlessness of that diesel would suit it better. And if a petrol doesn't give a pleasing soundtrack either, surely the 3.0 V6 is a no-brainer?
You see, with the adaptive suspension set to Comfort mode on our Spanish test route, the car never thumped or thudded once, even when aimed with the deadly focus of a hunting hawk at the one and only pothole we encountered. And other than the odd shimmy through the steering column, body ridgity was so good, considering this is a long car with no roof structure, that the claimed 40% increase in torsional stiffness over the previous A5 Cabriolet might just be a statistic worth believing.
And while it’s not going to fizz your senses like an M Sport-spec 430i, tautened up in Dynamic mode and thrown at a challenging section of bends, the A5 Cabriolet does keep its cool and stays composed, even with some tricky undulations thrown into the mix. The steering is also accurate, if mute, and there was even a moment of promise when, exiting of an off-camber roundabout, the rear playfully rotated with a squeeze of the throttle. Sadly, this proved to be a one-off, and subsequently the A5 just gripped and went, with only tedious understeer if we overcooked it. Still, somewhere in that deeply conservative chassis set-up, there’s potentially some fun to be had, and otherwise it's totally safe and secure.