For outright zip, ultimately it failed to match a car some 400kg lighter and with a significantly lower centre of gravity, and nor was it quite so confidence inspiring when the Armco loomed. But it was arguably the greater feat of engineering purely for its astounding body control and the fact that it was actually enjoyable to punt along a road that could have been bespoke-laid for a Lotus Exige.
As you may have surmised, our long-termer was the steed between home and a gruelling race weekend during which BMW launched its latest M-badged road car, and therein lies the true appeal of this M5. Some back-road fun sandwiched by substantial highway blasts resulted in around 900 miles and an overall fuel economy of 21.4 mpg, for a total expenditure of roughly £260.
No, this 4.4-litre twin-turbo V8 was never going to set records for frugality but, if the car impresses on more tortuous routes, it’ll blow your mind on a derestricted autobahn. How fast? An indicated (and restricted) 164mph, at which point your estimated time of arrival goes into free fall with that engine still pulling damnably hard.
Perhaps of greater significance is that proceedings remain serene enough that you’d barely have to raise your voice to be heard by those in the back. More prosaically, the M5 simply makes things easy on this kind of trip.
You can angle the headlights for Continental duties at the touch of a button and the head-up display converts your speed and speed-limit icons into km/h. It is comfortable, it is spacious, the Harman Kardon sound system is very good and you don’t worry about leaving the thing in a strange corner of an unfamiliar town after a mammoth day in the saddle.
It is quite stocky, though, with a track width that’s more or less equal to that of a Lamborghini Huracán Performante. It means there’s now a small nick on one of the alloy wheels, inflicted by the ghastly width restrictors on the top deck on the Eurotunnel trains.
Every time I’m lucky enough to drive this car, three things occur to me. The seats are set too high, the body control is simply a touch close for everyday driving, even for a super-saloon, and, God, how I wish they’d made a bit more of the wheel arches.
But while it takes me a little time to get onto the M5’s wavelength, once there I’m pretty much smitten.
CRUISE MISSILE No surprise that a 600bhp saloon with massage seats can seemingly condense international travel, but it’s a lovely sensation all the same.
TOURING RANGE ‘Loathe’ is strong, but if the 70-litre fuel tank was just a little bigger, you’d easily manage 450 miles between cruising fill-ups.