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That is the EPA standardized formula and it's what each manufacturer uses to establish the dynamometer Test Load HP coefficient they derive FROM their "road load" coastdown tests.
However, that EPA equation is (to my knowledge) ONLY valid for 50 MPH since it is actually published as (EPA test speed is 50 mph):
TLHP = (a + 50·b + 2500·c)/7.5
Last edited by gone-ot; 06-17-2013 at 07:59 PM..
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