At 08:27 PM 8/28/2007, Maggie Dew wrote... >Sorry, I thought the p-mail about mythbusters was cc'd to the list (I >only >get digest). > >Apparently episode 38, Season 3, concluded that above 50 mph you get >better >mpg with AC on and windows up (drag factor), but below 50 it is best >to have >AC off and windows down. Too many variables. Mythbusters is entertainment, not science. R-12 or R-134a? Modern variable displacement compressor? What difference does the inside/outside temperature differential make? Were the aerodynamics of the vehicle measured to determine the difference (windows open/closed)? How does that difference compare with other vehicles (specifically the Vanagon, where I can't imagine you can do much to make it worse, including opening the windows)? |
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