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...the basic constant-power approximation (CPA) equations for ET and MPH from vehicle WT and HP are:
ET = 5.82 * (WT / HP )^(1/3)
MPH = 232 * ( HP / WT )^(1/3)
...or, approximately: ET = 1350 / MPH
...let me know if you want to know *where* the constants 5.82 and 232 came from.
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