The two-day economy driving event, now in its 12th year, is taking place at Tankersley Manor, near Sheffield, sees a motoring journalists and senior figures in the automotive industry battle for the title of best overall mpg and best percentage improvement.

Vehicles being tested range 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 Citroen 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