I suspect, but don't know, that regen efficiency will vary depending on regen rate and battery state of charge. I've read that this is the case for motor output so I assume it is the same in reverse...
As for throttle, on my gen 3 there is no 1 pedal position that coasts. Above ~10mph with the accelerator pedal off, the generator regens slightly to mimic an automatic transmission's drag. From ~5mph to 10mph, zero pedal coasts. Below around 5mph, zero pedal actually applies a little bit of power to creep forward (again like a normal automatic).
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