Late last year, we reviewed BMW’s i3, a range-extended plug-in hybrid electric vehicle (PHEV) that impressed us despite its high price and limited range. That car is one half of BMW’s i Project, a sub-brand created to showcase the company’s vision of sustainable mobility. The i8 is the other half. It’s a plug-in hybrid sports car made from carbon fiber and aluminum. As such, it looks like very little else on the road.