Evarts asked about the i3's optional range-extending engine and, even though Kranz wouldn't discuss specifics, Evarts prodded Kranz enough that BMW's range-extending solution was revealed.

When it's not carrying around the extra fuel tank and engine, the all-electric ... an all-electric range of 81 miles. BMW expects to deliver the first i3 REx in the US this week and delivered ...

At the heart of the BMW i3 is a bespoke electric motor tagged BMW ... For the record, the range extender engine is a 650cc motorcycle-derived parallel twin-cylinder petrol unit mounted above ...

The pure EV version will cost pennies to run, but it’s this REx ... BMW claims average fuel economy of 470.8mpg, but unlike rivals that depend heavily on their combustion engine, you can drive ...

BMW i3 Mk1 (2013-date ... but its heating system contains long-life coolant. The i3 REx has two cooling systems (for the heater and engine) and its chain-driven engine needs an oil and filter ...

The BMW i3 that Rich bought does have a Rex, achieving total ranges of about ... The range extender is a gasoline-powered two ...