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Discussion Starter · #1 ·
My 2007 AWD was doing 17mpg in the city. Past few months it is down to 13.5mpg. It has 88K on it. Bought it 2.5 years ago with 57K.

I keep 5W30 full synthetic oil in it, K&N air filter.

Couple months ago I did add best fuel treatment for couple of full fuel tanks.

What might be a cause? Spark plugs? What else could I try?

Thank you,

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