Use at least 2/3s of the fuel before filing unless it will same you an extra stop on a longer trip. The reason why each time you make a detour just to stop and get gas you added distance to your trip and will add another open loop cycle using more fuel than if it was not restarted. If you turn right off the road go 150ft fill the tank and get back on the road by driving another 150ft in 17.5 stops you have added a mile of unneeded driving that could have driven you somewhere.
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"It's not rocket surgery!" -MetroMPG
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