On a damp and wintry day, the Panamera 4S Diesel batted off the conditions in a show of spectacular force, making its two-tonne kerb weight seem as nothing when we attached our timing gear to it.
In terms of outright speed, the car surpasses most benchmarks set by like-for-like grand tourers and can be considered alongside the quickest super-saloons you might buy for the thick end of £100,000.
This V8 diesel Porsche outsprinted the last BMW M5 we figured as far as 60mph and gave the impression that it might even go a tenth or two quicker still in better conditions. Needless to say, it has unflappable traction.
In terms of refinement, the Panamera is as well isolated and quiet as anything intended for a markedly sporting audience.
It’s not the most luxurious GT of its kind, but in the light of other talents, it is a brilliant compromise.
Real-world fuel economy and range is as outstanding as the acceleration. This is a near-43mpg cruiser with a 90-litre tank, capable of more than 800 miles between fills.
That’s a formidably strong hand for any GT, and yet the Porsche plays its cards with a flourish. The twin-turbo V8 has an energetic timbre distinct from that of the Audi SQ7, feeling smooth and settled on part throttle but revving with greater drama and edge.