Thread: Gas question???
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      12-22-2012, 11:32 AM   #22
ctuna
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Drives: 325xi 06 wagon MT
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The other part of that reasoning is condensation.

The more air in the tank the more surface area and air for water to condense on out of the atmosphere. I fill mine at half unless I am on a highway trip.
Also its psychologically hurts less to put a half a tank in than a full tank when you look at the cost though logically not any different.
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