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Few people have true 20 kW. I get 60 mi/hr at a true 20 kW (250V service * 80A, although some is lost to the cable dissipation). Most people have 19.2 kW (240V * 80A). So 59/19.2*16.8 = 51.625.
But either way, it's close enough to estimate it at 3 * kW.