BMW may be steadily working its way through the single digits when it comes to the i sub-brand of plug-in vehicles for the next few years. The automaker started with the i3 and the i8, and we heard rumors about an i5 and an i7. Oh, and we've heard about a potential i4, too. None of these have been confirmed. Still, next up is the i6, according to Automobile. There aren't a ton of details, but the all-electric vehicle would be about the same size as the 3-Series line that's long been a workhorse for the German automaker.

Like the other Project i vehicles, the i6 would have a lot of carbon fiber in order to reduce weight and help with range extension. The model would also likely have multiple electric motors as well as a state-of-the-art lithium-polymer battery that would provide a big single-charge range, though, again, no specifics on that number.

Word got out earlier this year about a supposed i5 model that would be a plug-in hybrid with a gas-powered engine and two electric motors that combine for about 540 horsepower. Other reports said that the four-door sedan would actually fall under the i7 badge. BMW North America chief Ludwig Willisch said this past spring that the sedan in question wouldn't be seeing the light of day any time soon.

BMW has already doubled US sales of its two Project i vehicles this year. Through November, Bimmer's sales of its i8 plug-in hybrid quadrupled from a year earlier to about 1,600 units, while sales of the i3 electric vehicle jumped 89 percent from a year earlier to about 9,600 vehicles.

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