Si comme moi, vous avez un problème de calibrage de la jauge à essence ... j'ai trouvé cela sur une liste de diffusion ...
I once worked out the geometry of the Seven petrol tank in order to check
the total volume and create a calibrated dip stick (a piece of wooden dowel
with the 25%, 50%, 75% and full marks in the correct spots on the wood.
It turns out that the odd wedge shape of the tank results in a geometry that
has a very linear relationship between volume and dowel depth.
For a wooden dowel inserted through the filler neck to the deepest corner of
the tank, the calibration marks are:
0% full = 0.0 inches
25% = 4.5 inches from bottom
50% = 6.5 inches
75% = 9.0 inches
Full = 12.0 inches
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: 
Et en clair( français) ça dit quoi? 
)
