I've driven a Toyota Prius, and it's a hoot. You get this animated dash diagram of the motor/turbine and engine, tank level and battery charge, where they stand at any given moment. Drive up a hill, the battery level goes down. Brake down the hill, the battery recharges. There's something about getting free fuel from gravity I like very much.
On the other hand these cars slaughter pedestrians. They can't hear you coming. Need noise generators.
I understand a major problem with hydrogen fuel cell vehicles, presently, is the high pitched whining noise they make.
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