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aerohead · 03-02-2016, 06:57 PM

I compared the aerodynamic power at 73-mph and 55-mph.The higher speed requires 2.3 X more horsepower to overcome air drag.
If the BSFC of the Toyota's powerplant was constant,then we'd expect the engines fuel requirement for air drag to increase this 2.3 X factor,since it mirrors the power.
Rolling resistance would increase arithmetically as it's basically a linear relationship up to 100-mph or so.
38-39 mpg at 73 is pretty sweet! The EPA numbers were figured at more like 50-mph.

03-02-2016, 06:57 PM	#41 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,391 Thanks: 24,469 Thanked 7,409 Times in 4,800 Posts	lower speed I compared the aerodynamic power at 73-mph and 55-mph.The higher speed requires 2.3 X more horsepower to overcome air drag. If the BSFC of the Toyota's powerplant was constant,then we'd expect the engines fuel requirement for air drag to increase this 2.3 X factor,since it mirrors the power. Rolling resistance would increase arithmetically as it's basically a linear relationship up to 100-mph or so. 38-39 mpg at 73 is pretty sweet! The EPA numbers were figured at more like 50-mph. __________________ Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/