The P has a more reliable engine, the Lycoming O-320-D2J.
The maximum range for the flaps was reduced from 40 degrees to 30 degrees in order to reduce weight and allow a 100 lb increase in carrying capacity.
Yeah...it's a piece of junk. If the hull is in good shape and you can get the plane cheap enough to put a newer engine in it on an STC and still have the plane come in a little less expensive than a 172P, go for it. Otherwise, go for a 172P or later.
The best rate of climb for a 1984 Cessna 172P is approximately 730 feet per minute at sea level under standard conditions. This performance can vary based on factors such as weight, altitude, and temperature. Pilots should consult the aircraft's Pilot Operating Handbook (POH) for specific performance data and adjustments for varying conditions.
John Edmonds has written: 'Health, Safety and Security in Leisure and Tourism' 'Container Plant Manual (172p)' -- subject(s): Plant propagation, Nursery stock