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aerohead · 11-14-2009, 04:50 PM

If you have a really good baseline on the car,and after modifying you experience a change in fuel economy,you can calculate your new Cd through the back door.
At 55-mph,a 1% improvement in mpg equates to a 2% drag reduction.
At 70-mph,a 10% drag reduction will net you a 6% improvement in mpg.( apologize for mixed units,don't have calculator with me ).
Hope that helps.

11-14-2009, 04:50 PM	#4 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 15,883 Thanks: 23,957 Thanked 7,219 Times in 4,646 Posts	baseline If you have a really good baseline on the car,and after modifying you experience a change in fuel economy,you can calculate your new Cd through the back door. At 55-mph,a 1% improvement in mpg equates to a 2% drag reduction. At 70-mph,a 10% drag reduction will net you a 6% improvement in mpg.( apologize for mixed units,don't have calculator with me ). Hope that helps.