The other reason to fill the tank is to keep condensate from forming and mixing with the gas. Especially if your fuel has enthanol in it.
Also a reason not to run the tank dry as water is "heavier" than gas.
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Mike
04 Boxster S - Basalt/Savanna, 6sp, Carrera lites, hardtop
70 914-6 - Black over tan, original/stock
PCA since 1970
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