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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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It's not so much the moisture in the air, or the converter, as much as it is the fact that gasoline gets converted to water (vapor) during combustion.
One reason you don't want to start and run the engine briefly is that the water vapor will condense and pool in the (cool) muffler. -next start will take even longer to heat/dry the standing condensate.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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