I am having trouble finding out how it all works. I and me mate started the game today at around 3.5k avg xp. After that session, his avg. xp went to 6.5k and my xp was 4.5k. I had a better score and more crash site points than him. How does this even work?
Because it includes all your bonuses and skill assessments that come up afterwards. Remember it's average XP, not average score, small but crucial difference there...