Here's some GM information on the 2014 GM Spark EV:
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All Electric All the Time – The 2014 Chevrolet Spark EV
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http://sandyblogs.com/techlink/?p=2073
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http://sandyblogs.com/techlink/?p=2079
...wow,
definitely NOT very fast re-charging on 120VAC!
...and, what the heck is the dumb idea of using two different tire sizes(?)...
unless(!) that's the 'new' secret to better efficiency (narrow front, wide load rear).