A method for storing, in the rewritable memory of an automobile electronic control unit, calibration data functionally equivalent to a set of various models (M1-M5) of complete calibration data, this method including operations consisting in recording a single copy (CALIBAS) of common calibration data (COM1-COM4), and specific calibration data (SP1-SP5) relieved of these common data. The method uses the relations existing between the various versions (SP1-SP5) of specific data to further reduce the memory space dedicated to storage by defining, from among these versions, standard versions (T1; T2) and variants (V11; V21, V22), the variants being relieved of data already contained in the standard versions (T1; T2).