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It would need to provide at least 50 Watt per kilo (25 Watt per pound) or its mass alone would hurt acceleration even at full output, assuming a typical 1000 kilogram econobox with an 50 kW engine.
Can you show a memory wire motor that can provide more than 25 Watt for every pound of its own weight?
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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