[spacenick88]

Afaic the upcoming Porsche Taycan has a two speed transmission. In the Taycan it's used for more efficiency at >160 kph or so something an American car really doesn't need and it costs them a slower 0-100 kph. Tesla uses another trick to get better acceleration to 100 kph. They have two motors and one is geared for high efficiency at US highway cruising speeds (so ca 120 kph).

In general electric motors have a very wide band of excellent efficiency and an even wider band of great efficiency and they are orders of magnitude more efficient than ICE in any part of their operational torgue/speed range.