Basically they use a small petrol engine to power electric motors that are used to turn the wheels of the car, they save petrol due to the electric motors being very efficient in power delivery and due to the fact they can charge their own batterys while going down hills and stuff like that.
Basically though they are pretty crap if your after performance because of their little ****-weak engines, there have been a few crazy electric cars and bikes made but they just dont have the attitude and presence of a big fat internal combustion engine sucking in as much fuel and air as it can so it can lose most of its energy to heat loss and use the rest to melt a few black circles of rubber called tires. God damnit i love horsepower..
does that answer your question? :)
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