It does help Mach Tuck.
However, seems to me I wasn't clear enough.
The graph is from the AFM/POH. The author of the graph is Cessna.
What I don't get is the constant 0.04217 for the fuel tanks, that someone used in an Excel Spreadsheet, to mimic the graph.
You just enter the gallons, the spreadsheet multiplies by 6 (6 lbs / gal) and then multiplies again by 0.04217. And it gets the precise moment.
Now, where did the number 0.04217 come from? (Not just this number, but any number...)
I can't really buy the idea that 2 different persons just derived mathematically this value by applying some unknown formula from the AFM's graph.
If it helps, the baggage area 1 and 2 respectively have the 'constants' 0.06346 and 0.08666.
The AFM does give us the stations for the baggage areas, but in this spreadsheet they aren't used at all.
But from your answers, I can see that this "constant" number isn't really a part of official documentation, AFM/POH etc, right?