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I generally run my 18+ gallons tank down to the point where it takes 15-16 gallons to fill.
Any lower and you may cavitate the fuel pump if it is an in tank type. Since the fuel also acts as coolant for the pump running it to empty can cause premature fuel pump failure.
I may fill earlier if I take a road trip and want to get back on the same tank of fuel since it is generally less expensive here. Anything below 500 miles round trip and I can make it on one tank.
regards
Mech
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