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But I don't know if the 250 mile range would be reduced too much on an electric vehicle, since it uses regenerative braking.

In an EPA highway test, they leisurely accelerate to a certain speed, the slow down and speed up periodically in some prescribed pattern. That's very different from track driving, where you go from 100% throttle to 100% brake over and over. Casual braking may be good for regenerative braking, but heavy (threshold) braking would far exceed what the car can store. Because of this, the benefit of regenerative braking would be reduced.

Admittedly, I don't know the charge/discharge characteristics for their battery packs, but I would imagine high amperage track use would be less efficient (more energy lost through heat due to internal resistances) than lower amperage draws.

Just my $.02
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