Now this is a blast from the past! A first gen RAV4 EV was recently spotted in the wild. When it was new it was rated with a range of a whopping 95 miles.
95 miles of EPA rated range from a 27 kWh NiMH battery pack. Assuming at least a 5% buffer, its efficiency would have been around 3.7 mi/kWh—the same as the EPA rating for a BZ4X.