Frank
Most tracks were slightly altered, which naturally also, more or less, affects track length, speed and thus consumption. I'm still getting myself up to speed on these things but the creation of some tracks was outsourced and apparently some tracks, namely Australia and Indonesia in particular, were done in the wrong scale and thus much too short. This is a bug. Furthermore it was said some tracks used wrong values for the simulation (also some simulations went somewhat haywire) producing weird races, so that could've played a part here as well, but I'm not sure if Australia is one of these tracks, though.
from what I've read from Jack and Jose, mostly, its Malaysia and Australia which seem to have been scaled incorrectly or sth and that has caused everything to be vastly different