What all that technology and deep engineering skill has done is pretty much disguise the potential negatives of a diesel and leave the way clear for you to get on with enjoying the benefits: chiefly a silky torque delivery that should be celebrated for how it pulls such a large car along so effortlessly. It's a marked contrast to the manner in which the aforementioned SQ7 drives, too: the Bentley makes the Audi feel like a rather blunt - if appealingly sporty - instrument in comparison, which is a credit to the work of Bentley's engineers on and around the powertrain's settings and ancillaries.
Really, for most owners most of the time, all that is required is to engage the smooth eight-speed automatic gearbox and let it make light work of hauling along this 2.5-tonne car. The revs rarely build beyond peak delivery at just over 3000rpm, and progress is both swift and refined. If you must, you can engage Sport mode and stretch the revs to close to 5000rpm, but the extra thrust hardly seems necessary - although it remains appealingly smooth and progressive - and the impact on the cabin acoustics is both slight and inoffensive. As befits a Bentley, impressive performance is delivered in a very civil, discreet manner.
Over our varied test route in Spain the trip computer claimed 26.5mpg, and while that's hardly a scientific means of measurement, it is a fair improvement over the W12 and a reasonable indication that the theoretical range of 621 miles could comfortably be a reality of around 500 miles, which is surely enough for chauffeured drivers never to see a fuel station or for cross-continental travellers not to be forced to stop too often.
Everything else is the Bentley Bentayga as we know it, so it's luxurious, spacious, well appointed and, above all, just so, and it bears repeating that it has already seen off the Range Rover in an Autocar group test and been awarded four and a half stars in our road test, albeit both in petrol form. There are arguments that the two-car test might be closer in a diesel versus diesel battle, but that would be entirely down to the Range Rover diesel being so clearly in its sweet spot, not because of any shortcomings with the Bentley powertrain.
Niggles - and that is all they are - are few and far between. There’s little sense of connection with the road through the tyres or steering wheel, the ride on large bumps at low speeds could be slightly better and perhaps there are rather more driving modes than anyone will ever use (Snow, Sand or Wet Grass modes, anyone?), but perhaps that is to prove the point that if you need assistance, it is there. The infotainment system is as close as the interior gets to being disappointing, chiefly because Audi’s latest tech is easier to use and looks more modern, but Bentley may reasonably claim that its customers are more traditional. Overall, to find faults you have to be very picky indeed.