When you talk to people about the BMW i3 ... looking to get in the back will have to be small because despite using a teeny-tiny electric motor, the REx also makes use of a small 646 cc engine ...

The i3 REx also ... tank and engine, the all-electric i3 gets 124 MPGe (combined), which is the currently the highest in the US. The i3 EV also has an all-electric range of 81 miles. BMW expects ...

Remarkably, BMW also claims that you can charge the battery back to full ... for you, the i3 will be available with a range-extending internal combustion engine (dubbed REx) further down the ...

If you bought a BMW ... extender (REx) with the same BMW-developed electric motor but also a 647cc two-cylinder petrol engine ...

BMW's remained relatively tight-lipped on potential i3 and M3 powertrains, but we do know that the M division has been experimenting with quad-motor powertrains for at least a couple of years in ...