I went from Bethlehem, PA to DC and back last fall-- average speed with some traffic in the city was about 62mph. I did the whole trip (444 miles, it read) on almost exactly one tank of gas (came into the gas station I filled up at when I left with the gas light on for the last 15 miles). On normal Hwy driving I usually see about 20, city is 4-7 less.

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2006 4.8is LeMans Blue