alcivic -
I have head that this is true for airlines because they are able to save fuel doing this. I don't think it translates to cars because they don't travel fast enough. Didn't UPS have an ad where they were washing their big brown jets a long time ago?
Here is the only tangential example I could find :
Clean Drives Airline Fuel Efficiency - June 10, 2008
http://greentechnolog.com/2008/06/cl...fficiency.html
Quote:
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... "American and Southwest are washing a handful of jet engines each night, a process that used to happen only during thorough maintenance overhauls. Southwest figures it has already saved $1.6 million in fuel costs since April by reducing the drag caused by dirt and debris. " ...
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CarloSW2