VP959 did you notice post #138,
The engine stopped with about 5-7 litres showing in the port visible fuel gauge.
I as a CT owner would be very worried if I ran out of fuel in this config. Fact is we flew over the sea with one tank emptying a lot faster, but the fuel fed fine from the other fuel tank. Lesson learned was to straighten up and fly right.
AFAIK all flat tanked (in the wing) planes will have this characteristic, especially if the dihedral angle is shallow, esp high wing vis a vis low wing. Try half filling a tray with water and observe as you walk.
There is a big discrepancy between half a litre from FD and 124/130 usable per USA LSA category POH. I would be getting very worried below say 15litres.