I first assumed that they just made a mistake and added by accident a 1 before the distance which would make the distance 629 km. However, if you check the other way round - Khon Kaen to Chiangmai - the distance is 652 km. so my assumption seems not to hold water.
Also the distance is different from Chiangmai to Trat (1176 km.) than from Trat to Chiangmai (1011 km.).
Maybe Singbimmer can shed some light on that as it was his/her very first post to the GT Rider Board.
As I understand, the distances have been computed using major routes.
Some distance had to be calculated using; from X to BKK + from BKK to Y.
Is this website also tell me the UK travel distance??? Please let me know is it possible on this website or not?? If not then let me know where i can check the travel distance for UK places..I hope you guys will share some tips or sites.......