Frank I agree that hybrids make the most sense in city driving.
I would love to see a diesel hybrid setup that uses electric drive and only uses the diesel engine for charging the batteries. In Amsterdam they have a project called the Whispering Wheel. They converted buses to be electric and removed the diesel engine and replaced it with a smaller diesel generator to charge the batteries. The smaller diesel engine is always running at the engines most efficient rpm. The bus went from something like 4mpg to 13mpg.
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