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Actually on a theoretical level that is not correct. Theoretically if you had a proper generator and a battery pack to handle the acceleration loads you would use FAR LESS energy end up net plus at the end of the day (compared to just using the engine to move the car)
This is because using electricity to move a car is far far far more efficient than using gasoline.
A generator is in theory far more efficient than an engine because the gen only has to run at one speed. OUR problem is strong enough generators are crazy expensive and integration electronics don't exist on the consumer level yet.
for example my Genset is a 6000watt generator. thats only 41amps. Barely enough (maybe) for level highway cruise maybe.
In reality I would need a 80amp generator (12,000 watts continuous) since gensets are LEAST efficient at full load and most efficient at 50% load.
Thats a very big very expensive generator :-)
then you need integration electronics to be able to "MANAGE" the battery charge and discharge Generator output and how this power is all sent to the controller.
Also our generators are not all that efficient really. Remember these things are designed for power stuff at a campsite powering your home essentials during an outage or equipment at a work site.
Mediocre efficiency is "good enough" for all these applications so thats what they design for.
but it would still be more efficient than a gasoline engine directly powering the car.
worth the hassle? probably not. Keeping a 2000 watt HONDA generator in your BEV might not be a bad idea though since you can slow charge from a 110 outlet. If you ever run out of go juice you can plug it in go find something to eat or see a movie for 2-3 hours and come back to maybe enough charge to at least get home.
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