A fourth engine will join the Range Rover and Range Rover Sport line-up by the end of the year, with the all-new TDV8 twin-turbo diesel bringing added potency and torque to the off-road market. The 3.6-litre unit’s power won’t impact upon fuel consumption figures, as it returns a commendable 25.5 imperial mpg (roughly the same as the TDV6 in the RRS), while the TDV8 will be sold alongside the existing engines – the TDV6, V8 petrol and V8 supercharged. In the Range Rover however, the TDV8 will replace the old TD6, renouned for its lack of power to shift the Range Rover's hefty weight. Acceleration is vastly improved, with the 0-60 time dropping from 12.6 to 8.5 seconds, no doubt thanks to the power increase over the TD6 of 98bhp and 148 lb/ft. It will receive the same stiffer suspension as in the Range Rover Supercharged, as well as Brembo brakes. It is expected to take around 85% of Range Rover sales. All RR Sport models will be refreshed to coincide with the launch of the new diesel addition, with the range receiving an improved specification list. Pricing details are yet to be disclosed, but the diesel RRS is expected to cost about £44,000.