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I think the Lina may use super efficient hub motors. And weighing less than 700 pounds makes it much lower consumption. Doing the rough math, 5.7kWh for ~50 miles is 114Wh/mile, which is quite plausible. This is similar to the Edison2 VLC Electric which was under 100Wh/mile, if my memory serves me. The electric VLC was a relatively porky 1140 pounds. It had much better aero than the Lins, but it used a DC motor; which are far less efficient than a hub drive AC unit.
The Electrathon vehicle that C. Michael Lewis set the record run of 55MPH for an hour was using just 2 Optima RedTop batteries - I did the math when I was talking to him at the meet up in Watkins Glen a few years ago - and it was under 16Wh/mile.
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