Now in its 15th year, the event is being held in partnership with Barclaycard Fuel+ in association with TMC, and is being this year at the stunning Heythrop Park Hotel and the Heythrop Park Resort near Enstone in Oxfordshire.
Highlights of the event include a 600cc Caterham Suzuki and a 20-year-old Mondeo as part of a line-up from Ford Heritage.
Electric vehicles putting their eco credentials to the test and taking advantage of charging stations along the way include a Kia Soul EV and a BMW i3.
But perhaps the most unusual vehicle seen at the event this year has been the drone used to undertake filming.
Don't forget you can follow the cars online! Head to http://www.tracker.co.uk/mpgmarathon/
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