Again this is not 100% true.this was one of the main issues with the Volt. Chevrolet was ahead of its time and people did not understand it's powertrain as it is not a hybrid like other vehicles. It is 100% EV and the gasoline engine is only a generator. This is the same powertrain design used in huge Tonka dump trucks for mining that have wheels bigger than a full grown man.
The only other cars that i know which used this design were the BMW I3
The voltec system is different and more complicated than a pure series hybrid like the i3. You could get the i3 with or without the little generator. The i3 generator was also sized very small and you may have to pull over if you're out of charge and need to use the generator.
https://www.gm-volt.com/threads/chevrolet-volt-electric-drive-propulsion-system-unveiled.336470/
https://www.popularmechanics.com/cars/hybrid-electric/a6179/chevy-volt-hybrid-drive-system/
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