What is it?
The greenest version of Audi’s revised A6 range, which improves fuel economy, trims CO2 emissions and – most usefully – reduces company car tax liability.
Design tweaks have been subtle but well thought-out, both outside and inside. The MMI control system has been revised to be more instinctive to use and the satnav system has been upgraded. But the really important changes to the 2.0 TDIe are mechanical.
The old 2.0-litre ‘pump duse’ TDI engine has been pensioned off, and Volkswagen’s new common rail diesel engine introduced. To make the most of every last drop of diesel, taller gear ratios have been fitted, and now the power steering pump only operates on demand.
Similarly the alternator engages to claim energy that would otherwise be lost while coasting, and the TDIe’s ride height has been dropped by 20mm so the A6 will slip through the air more easily.
What’s it like?
Impressively economical, at least in isolation. Audi claims 53.3mpg on the official combined cycle, with the TDIe only available with a six-speed manual transmission. Carbon dioxide emissions of 139g/km are also good enough to give a rock-bottom company car tax band for a diesel.