The two-day economy driving event, now in its 12th year, is taking place at Tankersley Manor, near Sheffield, with a host of cars and commercial vehicles being put to the eco driving test by motoring journalists and senior figures in the automotive industry.

In total the fuel economy of 23 vehicles is being put to the test, ranging from a Peugeot 208 GTi THP 200 to a Jaguar XF 2.2D and including commercial vehicles such as the Vauxhall Corsavan, an Isuzu Eiger Double Cab Manual, a Citroën Berlingo and a Ford Transit Custom.

All of the vehicles in this year's event are fitted with TRACKER vehicle tracking systems. To see their progress, visit http://www.tracker.co.uk/mpgmarathon.