It is interesting to see the wide tolerance of the contractual performance of the Bf-109. The error of +/-5% on the top speed of 500 km/h translates into 10% or 50 km/h of allowed error in absolute figures. Add to that the wear of operations and you can easily have poor performers.
It would be equally interesting to know the tolerance of the British types, I would not be surprised to see higher tolerance values for the Spitfire, given the poor status of the Supermarine rigs and tools at the beginning of production (see the Leo McKinstry book on the Spitfire to have an idea about the mess of the Supermarine works in 1938-39).
PS: how nice if this variability is modeled ... it shouldn't be that difficult ...
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