what actually constitutes a " Round the World " flight
The rules, in general, are, the course shall be a closed circuit course that crosses all meridians, the course distance from the start point through each control point to the finish point shall not be less than 36,770 km, all control points shall lie at latitudes less than 66 degrees 33 minutes.
The engine seems to use 18.5 l/h at 75% power, but at what power is it used in cruise
The flight manual is available on the aircraft manufactures web site should you wish to obtain performance numbers.