A MILD-hybrid diesel engine is being introduced in the Range Rover and the Range Rover Sport making both vehicles more fuel efficient and greener.

The 48-volt system is mated to a straight six cylinder version of Jaguar Land Rover's Ingenium engine and is available in two power outputs of 300 and 350ps.

In the latest Range Rover it offers an average fuel return of up to 33mpg while in the Range Rover Sport its good for 34 to the gallon.

The new powertrain replaces the previous V8 diesel set up in both models and offers emissions as low as 225g/km in its D300 configuration.

The more powerful D350 version achieves up to 30.8mpg with emission of 241g/km in the Range Rover and 31.2mpg and 254g/km in the Sport.

Performance on both models is also improved and the Range Rover Sport can now hit 60mph from standstill in 6.5 seconds. Both models have maximum speeds of 140mph.

The new mild-hybrid engine is arriving as Land Rover is making changes to both Range Rover line ups with extra trim levels and more equipment coming on stream.

The Range Rover is now priced from £83,465 while the Sport costs from £65,295.

Full smartphone compatibility is now standard while there is also an upgraded cabin air filtration system.

Two new grades are being added to the Range Rover line up in the shape of Westminster Edition and SVAutobiography Dynamic Black models while the Range Rover Sport has new HSE Dynamic Black and Carbon Edition trim levels.

The new powertrain continues JLR's electrification programme and the mild-hybrids will join plug-in variants of both models.