To answer the original question, no I haven't.
Do I consider this to be a problem? No, because I am always conservative when it comes to fuel planning. Does this prevent me from flying "longer" legs? Yes, but in the type of flying I do at the moment, I have no need to fly longer legs, so I am perfectly happy with my conservative fuel-planning.
On the other hand, if I had any reason to fly longer legs and push the endurance of the aircraft close to its limits, of course I would make sure I knew exactly how much fuel my aircraft used. But I would guess that very few piston-engined aircraft (whether flown by a PPL or commercially) are operated in this way.
FFF
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