Google "EPA Test Car Database" and you'll find a link to: https://www.epa.gov/compliance-and-fuel-economy-data/data-cars-used-testing-fuel-economy Download the version you want and load it into a spreadsheet. The coefficients are in the right-most columns: Target Coef A (lbf) Target Coef B (lbf/mph) Target Coef C (lbf/mph**2) The HP power formula is: $E2*(B$2 + (B$3*$E2) + B$4*($E2*$E2))/375 $E2 - velocity in mph B$2 - Coef A B$3 - Coef B B$4 - Coef C 375 - constant So I was able to make this chart: The EPA has well documented test procedures which makes comparing different vehicles easy. Bob Wilson