>>You get 0 mpg when idling in stopped traffic.<<
I suppose it's worse than "0". Since in most cars the engine keeps running while stopped, it has the effect of a negative mpg on overall gas mileage. My 2004 Prius' engine stops when the traffic stops, which is great for mpg and air quality. And when traffic is crawling, I can usually rely on the electric motor to give me an overall boost to mpgs.
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