I think what is requested is the opposite and with a factor 100:
Convert 3.2mi/kWh to kwh/km
, without the 100 ×, works, though. (→ = about 0.194 kilowatt‐hours per kilometer
, so one has to multiply this by 100 to find 19.4 kwh / 100 km.
Apparently it is the 100 multiplier that prevent Kagi / WolframAlpha to give the result.