I think its just an arbitrary value they chose - that was the gist of the converstation anyway. Basically its a switch. Value 24 is infinite reading on (9999), value 0 is infinite reading off (some high number at higher rpm coast). That is all it represents. If your car cuts fuel at high rpm coast, use 24, if it does not then use 0. It is simply on/off switch.
jeffreymccoy 
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