Under record rules Fergal McGrath (left) and Julian Warren had to be in the car at all times
Two drivers set a new world record for fuel efficiency when their car covered 8,387 miles using £459-worth of diesel.
Fergal McGrath and Julian Warren stopped nine times to refuel their Honda Civic Tourer 1.6i which recorded an average of 100.31 miles per gallon.
The route took the pair, from Honda's European research and development team, across 24 EU countries in 25 days.
They are due to receive confirmation of their record at the Honda factory in Swindon later.
The drivers set out from Aalst in Belgium on 1 June, navigating the continent in clockwise direction and returning to the start point on 25 June.
Under Guinness World Records rules, the same two drivers must be in the car for the whole journey and the vehicle must be a standard model with no modifications.
The car had to enter each of the specified countries collecting a range of evidence containing GPS readings, video, photographs, and signatures from independent witnesses.
The men said they used techniques including careful route planning, driving smoothly and consistently without hard acceleration or braking, and anticipating road conditions ahead,
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