David Carter wrote:

> My first impression of the technical paper was that the writer was off > by an order of magnitude on the amount of water that can and does > condense on inside of, for example, Cessna 172 or 182 fuel tanks in > humit Gulf Coast areas, with cooling of air during the night, and > water condensing out inside the tank.
> . . . Of course that is the main reason that "good airmanship" says, > "Top off the tanks before putting the plane to bed for the night (or > longer)."
> . . . However and notwithstanding, there are times when the tanks may > not be topped off and then you'll get more water.
>  > These comments don't detract from or relate to Barry's excellent > "first take" summary.  I'm simply saying I think the author of the > paper is way low on his estimates and desensitizes his analysis of > effects of condensation of water out of humid air.

I also thought the point that .5% water in the gasoline will only make it .5% less efficient.  Water will act as a quenching agent, throwing the whole engine works off and having a disproportionate effect for it's volume.