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The problem with going strictly by weight is fluctuation in ambient temperature and condition of the system, externally. All cars have +/- refrigerant charge fudge factor.
If you want peak efficiency you will charge to a desired vent temperature, taking note of system cycles.
Your condenser or evaporator may not be as clean as another car, or the fan clutch might not be up to par (if equipped), making the system less efficient at a specified refrigerant weight. No car is the same.
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83 944
91 FJ80
84 Ram Charger (now gone)
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