I know one school which was quite keen on staying within weight on 100% of their 152 dual sorties. This is clearly something of a challenge, and essentially meant refuelling after every flight, which is a bit of a pain. So they got rid of them and bought 172s instead.
(Of course the 152s were perfectly safe overweight on a 2km tarmac runway, just not legal. The problem is, we were told, that they were certified for their original primary market, American farmers with 400 yards of grass strip, and it would have been impractical to recertify them for operation from proper airports.)