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I have a 2009 Traverse with 175k miles and watched my gas mileage gradually going down. I’ve replaced front cats, O2 sensors, spark plugs, coil packs all as needed but haven’t replaced the rear cat. Anyone replace rear cat and get better gas mileage? What are your thoughts. Right now I’m averaging around 13 miles/gallon. I don’t know what else to do.
 

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Hows the transmission?
I mean, say when youre on the highway doing 55-60 is the vehicle in 6th gear? (roughly 1900-2100 RPM?)
 
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