In my experience, lower than excepted range can be from a combination of the optimistic estimates (last X miles were fairly efficient), *fast charging, and route/weather (stop and go, uphill, wind, etc...). I think you've already hit the first two. Could there have been any differences in driving route, terrain, or weather that reduced range?
*Given some voltage cut-off, higher current usually results in less energy (fewer ah) being stored in the battery.
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