and the Single Charge "Highway" Range @70 mph cruise is 26 miles. 
Tom, try using an electric motor efficiency of at least 92.4%. According to:
http://www.engineeringtoolbox.com/electrical-motor-efficiency-d_655.html, electric motors constructed according NEMA Design B must meet the efficiencies below:
Power (hp)........Minimum Nominal Efficiency
20 - 49..............88.5
50 - 99..............90.2
100 - 124..........91.7
> 125................92.4
I would assume the motor in the Volt would meet this spec, and likely exceed it. The Volt EM could be closer to 95% efficient.
http://www.engineeringtoolbox.com/electrical-motor-efficiency-d_655.html, electric motors constructed according NEMA Design B must meet the efficiencies below:
Power (hp)........Minimum Nominal Efficiency
20 - 49..............88.5
50 - 99..............90.2
100 - 124..........91.7
> 125................92.4
I would assume the motor in the Volt would meet this spec, and likely exceed it. The Volt EM could be closer to 95% efficient.
