Ansett did this for years, it never seemed to cause any problems. We also had our line and sim checks scores compared to each other. Most managed to keep the little dot in the middle of the pack, which was comforting in a way. One character had his fuel uplift way above everybody else and eventually dropped back among the average figures, so it works. The only risk is there's always some ego maniac who would like to win the 'least fuel' prize. Even then, so what, he or she ends up diverting and is late getting home while the rest of us are having a cold beer.