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Here are some energy data on my Firewheel 16". The rule of thumb is 12Wh/km or 19Wh/mile. At lower speeds, it should be possible to get 10Wh/km. With a 130Wh battery, expect to get 11km range. With a 170Wh battery, expect less than 10 miles. There is a mean speed of about 22km/h over a distance of 20km with stops, intersection crossing, slowdowns... so my cruise speed is over 25km/h. Firewheel rocks ! Wheel = 13.6kg, rider = 65kg, total = around 80kg. Tyre pressure = 3 bar. Mean speed (km/h) and distance (km) measured by a "Sunding" bike computer. Energy (Wh) measured by Charge Doctor. Original data here, if you want to convert to other metrics (miles per 1kWh...). https://docs.google.com/spreadsheets/d/1MsuAMM87v9bv4sZ-I58M3dmKV1Iq0hnA0cyzTZ5mwkI/edit?usp=sharing