When the BMW i3 went on sale in the U.S. back in May 2014, it marked not only the debut of the German automaker's first mass-market electric car, but also a new sub-brand.
BMW originally planned to group all its electric cars under the "i" sub-brand, which currently includes all-electric and range-extended REx versions of the i3, as well as the striking and expensive i8 plug-in hybrid coupe.
But as BMW looks to expand the number of electric cars in its lineup, that strategy may soon change.
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