Fuel Consumtion: Sienna 2004 LE AWD

I have recently bought a Toyota Sienna 2004 LE AWD van. Toyota claims its fuel consumtion as 8L/100km on freeway and 11L/100km within city, where as mine is consuming more than 12L/100km on freeway as compared to 8L/100km. What could be the problem and how to handle it?

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Saleem330
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