One problem with today’s all electric cars like the Nissan Leaf is that their range is limited. For the foreseeable future, this isn’t likely to change drastically, with most experts expecting a 6 to 8 percent per year increase in battery efficiency.
On the other hand, range extended hybrids like the Chevy Volt are often not utilizing their gasoline engine for many daily trips, such as commuting to the office or grocery store. So the engine and fuel tank are dead weight in the car, lowering its overall efficiency.
The solution? Why not make the engine compartment modular?