Then maybe it is due to electrict motor's high efficiency at low speed

送交者: HunHunSheng 于 2005-10-13, 15:45:41:

回答: true wind resistance is a possible factor 由 4U4luC2 于 2005-10-13, 15:40:52:

We have

1. Gas motor's efficiency at high speed on highway

2. Gas motor's efficiency in generating electricty

3. Electric motor efficiency at low speed

If 3 and 2 is higher than 1, then it will
explain the phenomenon.