It is just as well the CLS 63 is a serious sports saloon, because Mercedes demands a serious price for it, and a signifcant premium over the outgoing E 63, with the new E 63 S expected to cost in the region of £83,000 - it will be £3k more expensive the four-wheel drive, 600bhp saloon.
It’s startlingly easy to add options you’ll think essential, too, albeit harder to chuck on it the £40,000 worth of our test car.
Nonetheless, the CLS’s relative rarity will ensure that residuals are competitive enough, and running costs are acceptable.
None of the CLS 63’s rivals can match the claimed 28.5mpg and 230g/km offered by this new turbocharged engine, even if it fails to translate into a massive real-world difference.
We still returned 19.8mpg overall and, despite its interstellar gearing (seventh gear can’t be selected below 60mph), returned only 25.8mpg at a cruise. That’s only a touch better than par for the course, in our experience.