a drag question

["Wickes, John" <JWICKES@COSMPDAERO.CO.SYMBIOS.COM>]

     Would an increase in altitude result in a decrease in the coefficient 
of drag 'C'? I think it would!

     As an example, I live at 8500 feet above sea level where the barometric 
pressure resides around 600 torr. Where I will drive to work is 6000 feet 
above sea level where the barometric pressure resides around 690 torr.
     Could I take the difference in altitude that  as a percent difference 
in the coefficient of drag ( like we do for the boiling point of water up 
here ) .
so at 8500 feet up
600torr/760torr =.79
if drag = .3 at sea level then at 8500 feet drag is
.3 (.79) = .237

and at 6000
690torr/760torr=.91
if drag = .3 at sea level then at 6000 feet drag is
.3(.91)=.273

cool eh? I thought of that while I was running some numbers through the Uve 
Rick ev calculator.  But because I will be going slow back up the hill 
(40mph) it does not improve the range all that much.  Just a thought..john 
wickes