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Q: What will cause my buick Rainier to get low gase mileage. on 2006 Buick Rainier

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What will cause my buick Rainier to get low gase mileage. I currently get 10mpg on highway?
(1) Answer
That is to broad of a question. How many miles on vehicle? What have you done as far as servicing the truck? I don't mean just oil changes.