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The driver of the car actually does more in this than most realize. I keep my speeds at or near 55 most of the time on the highway. You have to watch all the time for opportunity to increase speed without using fuel and when the opportunity arises you need to take it, then let that speed carry you up the next hill. I regularly get 60mpg out of my Prius by very careful driving. I wish more would try it this would send a clear message to the fuel companies.