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It might be possible to get 40mpg if you fill up and drive only on highway for 800 miles, without traffic, no head wind, no steep slopes and nobody and nothing in the car. But thats nearly perfect environment for 800 miles. and on top you are risking to ran out of gas and maybe some damage to the engine because it will be sucking air in the end.
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car history
1992 Toyota Corolla -->2002 Toyota Corolla -->2004 Toyota Camry 4cyl --> 2007 Nissan Altima 3.5SE CVT Radiant Silver/Winter Frost
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