The speed reported by the tables is the True Air Speed while the airspeed indicator reports the Indicated Air Speed. To shed some light on this, we published a post about it.
How to correctly compare the speeds reported by the performance tables with the one reported by the airspeed indicator.
The performance tables contained in the kneeboard were written by the aircraft manufacturer basing on data recorded on a full loaded airplane with a specific Center of Gravity (C.G.) position. This means that if you are flying with a different