Originally Posted by
IO540
There is arguably only one equitable way of doing this: charge for airborne time, and charge for fuel separately.
Technologically this is possible but since there is no tamper-proof flowmeter...
Oh io540, nothing works for you unless it's full of silicon and costs thousands of pounds. One wonders how people got along in the old days.
How about using a marker pen and a stick of wood. After a little bit of work you can even throw the marker pen away. This will allow you to work out how much fuel you start off with and how much fuel you have finish with. Use some mental arithmentic (remember that??) to calculate the difference and bingo, you know how much fuel you used.
I know you will find objections to this simple solution, but they are all easily worked around.