yes impossible, and I am surprised to find it, like I said, I could be wrong
the method I use to check mileage is above reserve.
Reserve capacity of mentioned bike is 1.5litre. Whenever reserve is demanded, I calculate mileage meter, pour petrol and undo the reserve and then find mileage till it ask for reserve again. I have been getting 50km by this method since 2009 i bought this bike. this is the first time, or it could be wrong calculations. I will verify it