I've got about 8,000 P1 on the 146 (albiet long ago), I recall we were restricted to FL260 due to the icing rollback issue on the ALF 502's fwiw. Low fuel was a tricky situation to deal with, especially if Holding (with turns always in one direction) fuel would tip from the higher to the lower wing tanks due to an always open high level weir, the type's anherdral added to the imbalance which had to be managed via cross feeding.