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aerohead · 11-20-2010, 02:41 PM

Darin,I believe that Hucho's book has CdA vs MPG tables/curves for both N.America and European test cycles.Sorry,don't have my book with me.
If one presumed that the Cd was un-changed and only the frontal area went up with wider tires,then the drag relationship would be arithmaic.Say,a 2% increase in frontal area would mean a 2% drag increase.
At 55 mph ( 88 km/h ) mpg would suffer by 1%.
At 70 mph ( 112 km/h ) mpg would suffer by 1.2%.

11-20-2010, 02:41 PM	#18 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 16,314 Thanks: 24,440 Thanked 7,386 Times in 4,783 Posts	Hucho? Darin,I believe that Hucho's book has CdA vs MPG tables/curves for both N.America and European test cycles.Sorry,don't have my book with me. If one presumed that the Cd was un-changed and only the frontal area went up with wider tires,then the drag relationship would be arithmaic.Say,a 2% increase in frontal area would mean a 2% drag increase. At 55 mph ( 88 km/h ) mpg would suffer by 1%. At 70 mph ( 112 km/h ) mpg would suffer by 1.2%.