Like I said I don't have a manual and dont' know how some of this work. If someone could help that would be great.

When is the fuel on and when is reserve?
is the on knob on top, arrow on 1 o'clock means on? and 3 oclock middle off? 5 oclock mean reserve?

Please advise?

And for reference, I can make 155km with 10 liter of gas.. Am i doing good?