Why does my jeep waste so much gas?

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New member
I drive a 2000 jeep grand cherokee laredo 6 cyl.
I am wasting over 45 bucks a week and I drive it less than 300 miles a week!
I dont think this is normal or even if it is
What could be wrong with my car? or how could i increase my car's performance?
I just bought it so probably there is some parts i need to replace
 
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