Why is the CASA CAAP sample fuel calculation in Appendix A (C-210) in Pounds? Why weight? The Gauges are in Gallons/Litres, the dipstick is in Gallons/Litres, and the bowser is in Litres. Why add another calculation? The 210 burns 60 litres an hour, if you have 200 litres on board, you have 200 minutes in the air.
Why? Why?