1,25 litres per hour if the 2hp is accurate motor in good condition, prop in good nick and matched to the motor and if the motor has a BSFC is around 500 to 600 grams per kW hour and the fuel has an sg of 0,73.
Worth noting if you were not aware, if wot is 5000 rpm, the throttling back to 4000 will about halve your fuel consumption per hour. Fuel/prop and power produced, reduces as a cube of the RPM.
No, you will not get from Waikouaiti into Dunedin on a tank full.
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