A testament to how time and trends change, the Audi A6 55 TFSI Quattro is a car that would have verged on being a super saloon not all that long ago. Powered by a turbocharged 335BHP engine driving all four wheels and with sharp lines, subtle bulges, huge alloy wheels and a vast hexagonal grille, it would have looked wild among, and driven with a pace few saloons could match some 20 years ago. But, in its own milieu, it is one of Audi’s most conservative and traditional offerings. However, and contrary to what some may thing, to say that a car is conservative is by no means a bad thing. The A6 competes in a premium brand executive segment increasingly dominated by heavy crossover SUVs compromised between road and mild off-road abilities, and so-called four-door coupes further encroaching on its traditional territory. A more traditional saloon, the A6 instead offers a sense of clarity, purpose and focus that elude most such trendy vehicles, and aren’t even matched by its own highly accomplished Audi Q5 crossover and low-roof sportback A7 sisters. Launched two years ago, the latest generation A6 is a sportier and more sculpted design with more defined surfacing and line, a big...