Not surprisingly, the efficiency specs here are much the same as those of this model's near-identically-engineered direct cousin, the Porsche Cayenne E-Hybrid. So think of a set of WLTP figures claiming this car to be capable of up to around 70mpg on the combined cycle and up to around 90g/km of CO2. As with all PHEVs, these are pie in the sky figures, but at least the emissions reading will mean substantial BiK tax savings over a comparable diesel model - say for instance, Audi's SQ7. Empty to full charging takes around 4 hours from a 7kW garage wallbox - or up to 6 hours from a domestic plug.
As usual with a PHEV, there's the option of saving battery charge for later in your trip (urban driving you might have to complete at the end of a long motorway journey for instance. And if the plug-in system's 14.1kWh battery is running low, you can (rather inefficiently) charge it using the V6 petrol engine as a generator. It's better though, to try and cope by simply increasing the level of regenerative braking. As for servicing, well as usual with Volkswagen models, there's a choice of either 'Fixed' or 'Flexible' maintenance packages. You'll choose the 'Fixed' approach if you cover less than 10,000 miles a year and with this, the car will typically be looked at every twelve months. If your daily commute is more than 25 miles and your Touareg will regularly be driven on longer distance journeys, you'll be able to work with a 'Flexible' regime that can see you travelling up to 18,000 miles between garage visits - or every two years, whichever is sooner.