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Lots of stop/go will drastically decrease your gas mileage. Have you reset your DIC to get a recent mpg average? I switched from a Vararam intake to a CAI and my average gas mileage went from 19 to 22mpg. I am mostly stock (no headers/no tune) and I drive a mix of highway/city so I feel like my mpg is a pretty good average. I would not suggest going to higher octane gas because it really won't make a difference in the LLT V-6.
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“The moment you think you know what’s going on in a women’s head, is the moment your goose is well and truly cooked”
-Howard Stark
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