My statement that it seems the Tesla S may get up to around 70% back was based on the data from the Drag Times article. The mass of the S is around 2150 kg, so calculate its kinetic energy at 114 mph, or about 51 m/sec, and take the ratio of the regen energy they reported, 0.6kWh, to that expressed in kWh. I get a kinetic energy of about 2.8 x 10^6 Joule, or 0.78kWh. Then 0.6/0.78 = 0.77. I suspect the reported 0.6 is off a bit, but then so is the simple estimate reported on the Tesla page.
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