Charlie Harding, from Swanley in Kent, who won the prestigious RAC Patrol of the Year award this year, will join the line-up of contestants for the MPG Marathon.
He will be taking part in his new Ford Transit Custom – complete with 500 parts and tools.
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The 28-year-old has been an RAC Patrol for four years after previously running his own garage.
He was named Patrol of the Year for his outstanding customer service and technical performance.
The award means that he can carry the P1 RAC number plate on his van.
Charlie will now take on the MPG Marathon, which sees key figures from the motoring industry race through the Oxfordshire countryside while trying to use as little fuel as possible.
And the Patrol said that he was looking forward to the challenge of participating in the event.
“It’s great to have the opportunity as RAC Patrol of the Year to take part in events like this, and with the new Ford Transit Custom I’m really looking forward to seeing how it performs,” he said.
“As a patrol vehicle it has been great, but I’ve not done anything like the MPG Marathon before, so I think it will be really interesting to see the MPG results when fully laden with all 500 parts and tools on-board.”
Setting off from the Heythrop Park Resort in Oxfordshire, the MPG Marathon will take place on October 18 and 19.
Charlie will be joined by colleagues from the RAC Fuel Patrol team, who will be on hand around the course to fill up petrol and diesel tanks as required.
It is the second time that RAC Business has supported the MPG Marathon, corporate business sales director Jenny Powley said.
She added: “As an event the MPG Marathon is really important in helping fleets understand the real world fuel efficiency of vehicles, in a range of classes, which is data that can potentially help manage fuel costs better.”
The event comes just weeks before the RAC Rally of the Tests on November 3 will see 100 competitors enter an epic three-day drive from Bournemouth to Chester.
To get the most our of your fuel tank check out our top tips for saving on fuel consumption.