Judges voted the XJ the best luxury car in terms of environmental impact in one of eight categories contested in the prestigious awards.
The winning model, the XJ 3.0 Diesel V6, is capable of returning 40.1mpg and emits 184g/km of CO2, but the judges were quick to point out other areas where the car impressed.
They said: “In a class dominated by understated design, the Jaguar XJ’s styling takes your breath away. It’s powerful yet athletic, imposing yet sleek. No other luxury car gets as much attention for the way it looks.
"You’ll enjoy driving the XJ an awful lot more than most of its competition, too. The Jaguar XJ is stunning, in every sense of the word.”
The latest iteration has shed 150kg of weigh thanks to aerospace-inspired aluminium body technology and reduced fuel consumption and CO2 emissions mean it is cheaper than many of its rivals to run.
What Car? editor-in-chief Steve Fowler said: "That low CO2 return means you’ll pay company car tax at just 28 per cent of the Jaguar’s price, so you’ll pay less to the taxman than you would if you drove most of the XJ’s rivals."
The awards measure CO2 emissions, other pollutants and a wide variety of other environmental factors including the impact of the ‘lifecycle’ of the vehicle.
The XJ uses 50 per cent recycled material in the body, saving three tonnes of CO2 per vehicle and Jaguar plans to increase this figure to 75 per cent.
Geoff Cousins, Managing Director, Jaguar UK said: “Environmental considerations are increasingly important to car buyers. By taking a lifecycle approach to the new XJ we have minimised the amount of materials used, we use recycled material and low-energy manufacturing processes, as well as making the vehicle easy to recycle at the end of its life.”
The new Jaguar XJ with the 3.0-litre AJ-V6D turbodiesel engine is available from £53,900 on-the-road.