I think it was a roughly 50/50 sales mix with a slight win for the range extender up until the point they discontinued it as an option in later revisions (with

I think it was a roughly 50/50 sales mix with a slight win for the range extender up until the point they discontinued it as an option in later revisions (with larger batteries). They had some mechanical issues with the fuel line that was a fire risk and they software locked it to reduce the tank capacity by 20% in the US so it wouldn't be classed as a plug in hybrid, but even with those problems I've generally heard positive things about it. Basically acting as reserve to avoid range anxiety on early small battery EVs when it was all quite new.