I disagree. cruising is where I already get the best fuel economy. I would get close to 60mpg if I never had to slow down or accelerate.
its the accelerating that ruins your fuel economy. this is WHY the prius gets such good mpg (well for its kind 46mpg is not very good)
cruising it would have the least impact AND be the most difficult since now you need an electric motor wheel gear combo that can handle the higher speeds. ie more expensive.
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