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Originally Posted by Kintak
I read somewhere that in the winter (at least in colder climates), you should keep your tank at least half full all the time to prevent fuel-line freezing.
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For a regular, fixed size fuel tank, that is correct. The problem is temperature changes in the winter can result in water vapor condensation in the tank . . . a bad thing. Small planes are always kept fully loaded to avoid the problem since water in the fuel line can make a take-off excessively interesting.
The Prius uses a bladder tank, which keeps out water vapor and contains the gas fumes. Unfortuantely, Prius fuel levels are not terribly precise because of this and the fuel tank capacity can vary. So the good news is very little gasoline vapor ever escapes. The bad news is the actual fuel capacity sometimes varies but not so much a problem . . . more of a quirk.
Bob Wilson