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basically none. I've read that many electric motors are most efficient at 80%+ load...

The problem is more that you hurt efficiency when accelerating fast. I'd rather a moderately reliable increase in range than improved periodic acceleration.

Essentially this is: How much does (say) 25-55mph in 2s vs. 4s cost for overall distance in normal traffic.

That said I have better things to spend 60k on than a car. (my last car was $18k, and 42k can be used for a lot of good things that aren't a fancy car. That said I would rather a car that can accelerate faster than a Prius C - my old 9k Yaris did much better, even though it used more gas)

You modulate your rate of acceleration with your right foot. If you want a car that accelerates from 25-55 over 4 seconds, drive that way...

The rate of acceleration is mostly irrelevant for the fuel consumption, unless your engine gets in a less efficient operating mode, which is not the case with electric motors. Often enough, this is not even the case with combustion engines, especially natually aspirated ones. Only if the higher acceleration also leads to overall higher speeds or additional breaking, energy is wasted. Otherwise, the energy used for accelaration is the difference of the kinetic energy at the high minus the one at the low speed.

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