How many countries is it possible to drive through on one tank of fuel?
The RAC has teamed up with Audi to find out - and perhaps set a new world record in the process.
Motoring journalist Andrew Frankel and racing driver Rebecca Jackson will take it in turns behind the wheel of an Audi A6 ultra, driving almost continuously on a 73-litre tank of fuel until there is nothing left.
Beginning in Maastricht in the Netherlands on June 9, they hope to pass through Belgium, Luxembourg, France, Switzerland, Lichtenstein, Austria, Germany and Italy towards the Balkans on their epic journey.
The route for the #RecordRoadTrip has been carefully planned by the RAC, trying to avoid the miles-per-gallon-sapping effects of built-up, congested towns and cities, motorways and mountains where possible.
Of course, not everything can be avoided. But both parties are confident of setting a new Guinness World Record for the most countries driven to on a single tank of fuel. They aim to set a hard-to-beat record that covers at least 10 countries.
The Audi A6 ultra was chosen for the record-setting adventure because it is a standard executive class production car, like many that are regularly driven on European roads by British holidaymakers every summer.
Its excellent fuel economy and large fuel tank also convinced the organisers it was the right car for the job.
Ben Wilson from Manchester, the RAC's new Patrol Ambassador of the Year, will provide roadside assistance during the trip, following the car from the Netherlands to wherever it eventually runs out of fuel.
RAC #RecordRoadTrip coordinator Simon Williams said: "We're confident the combination of two skilled drivers, a highly fuel efficient Audi A6 Ultra and a route that takes in the most possible countries in the least fuel-taxing way will lead to a hard-to-beat record that covers at least 10 countries, hopefully more.
"The Audi A6 ultra can do 67.3 miles to the gallon so we are looking at one tank of diesel taking Andrew and Rebecca over 1,000 miles, but driving a route of this length is never going to be straightforward and there will no doubt be many challenges along the way. That said, for most people, driving in Europe is usually far less onerous than they expect it to be.
"In order for the RAC and Audi to set a new Guinness World Record for the most countries driven to on a single tank of fuel we had to start the attempt in mainland Europe as ferry or rail Channel crossings are not allowed."
Copyright Press Association 2015