From an old brochure picked up eons ago:
At MGW & ISA, service ceiling is 10,900 ft, HIGE 5,160 ft and HOGE 2,950 ft. At ISA+20, HIGE falls to 2,750 ft and HOGE to 700 ft.
At 3,200 lb & ISA, HIGE improves to 9,400 ft and HOGE to 7,350 ft. ISA+20 is 7,200 ft and 4,950 ft, respectively.
At 2,800 lb, HIGE is 14,000 ft and HOGE 12,000 ft. ISA+20 drops this to 11,700 ft and 10,000 ft, respectively.
Max cruise at MGW & S/L is 97 kt, falling to 90 kt @ 6,000 ft and 73 kt @ 12,000 ft. At 3,200 lb, these figures improve to 99 kt, 96 kt & 87 kt. 2,800 lb takes them to 101 kt, 99 kt & 96 kt.
I/C