Re: new car
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The main benefit of hybrids is their regenerating capabilities through braking. Energy that is normally just lost as heat instead goes into charging the batteries when you apply the brakes. Hence in stop-and-go driving the batteries are charged and then utilized more.
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I am pretty sure that shutting off the engine at stop lights is a much bigger win than regentive breaking. In electical cars regentive breaking only increased battery life by 10% or so. You can also optimize the system a bit more when you have 2 propulsion methods to choose from
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