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The stall doesn't really determine the tapering curve; the battery in the car does. So a tapering curve at an urban Supercharger versus a regular higher power Supercharger would overlay on top of each other except that the urban one will just be cut off as a flat line at 72kW, (because it's not allowed to go higher) until the state of charge of the battery gets high enough that it would start to turn downward from 72 and below, and then the tapering curves will be exactly the same.