Jaguar's aluminium architecture is a significant contributor to the green credentials of the new XJ. It uses around 50 percent recycled material in the body, and plans are in place to increase that figure to 75 percent. This alone creates a saving of three tonnes of CO2 per vehicle, compared to a bodyshell made from new aluminium. Equipped with the 3.0-litre AJ-V6D turbodiesel, the XJ delivers an impressive combined economy figure of 40.1mpg and CO2emissions of 184g/km. The new XJ is priced from 53,900.