Math error: route kWh does not equal miles * Wh/mi

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A route planned shows a distance of 210 mi, average consumption of 326 Wh/mi and a total consumption of 72 kWh. But 210 * 326 / 1000 = 68.5 kWh, not 72 kWh. Math error?

The route is: https://abetterrouteplanner.com/?plan_uuid=7882fc27-bf98-4415-bdcb-11a98a4ededb