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I like the "Smiles To The Miles" factor myself. When my scan of the IP can see 1/2 or less in the fuel gauge, I tend to slip into my fav fill-up station. Too many things to mention can cause a bad miles to gallons ratio so if a tank or two doesn't bring it up to where my particular driving habit/gauged approximate historical location, I'll look for a reason. BUT, only after I rule out bad gas (from the 3.2L powerplant).
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