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aero and EPA
There is an SAE Paper from the 1970s which includes the relationship between aero drag and mpg obtained with the Federal Test Procedures for HWY and City cycles.
I'll dig that out when I can.
Revisiting an article for GM's 1984 Chevrolet Citation IV concept car,GM mentioned to CAR and DRIVER that narrower tires(P195/70R-13) were part of their strategy for their low drag.
Ford,for their Probe IV concept,choose P155/75R-16 Goodyear LDC-1 concept tires.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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