If it's $.27 per kilowatt hour, I imagine it would be $0.00027 per watt hour. (Just converting kilowatts into watts) So, when you're pedalling along at 4 watt hours per km then it would work out to $0.00108 per km, if my math is correct. Basically you can multiply your watt hours per km by your cost per watt hour to get whatever. (IE You can also figure out how much it is with pure assist and no pedalling if you really want to)
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