Three plug-in hybrid versions of the Jaguar XJ will enter the RAC Future Car Challenge.
Instead of the standard car's 5.0-litre V8, the special XJ models will be powered by a 2.0-litre turbocharged engine coupled to a 69kW electric motor and 12.3 kWh lithium-ion battery.
This allows the XJ to run on electric power for around 25 miles at low speeds, and means fuel economy figures of 73.5mpg and CO2 emissions of just 75g/km.
The cars will take part in the competition to drive the 63 miles from Brighton to London using the least energy possible. Drivers must get to the finish line within a minimum of 2 hours and 35 minutes and a maximum of 3 hours.
Pete Richings, Director of Jaguar Land Rover Hybrids & Electrification, said: "Jaguar Land Rover believes that the RAC Future Car Challenge provides a great opportunity to showcase our low carbon technologies, testing them under real-world conditions with 'normal' drivers and assessing their real-world performance alongside other technologies."
The event takes place on 3 November, ending with a Motor Show-like display on Regent Street, London. For more information go to www.futurecarchallenge.com.