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Discussion Starter · #1 ·
Hello
I have a 2004 gmc envoy slt xuv. I am running synthetic oil, a k and n air filter, and a flowmaster 40 series exhaust. I am still only getting 18 miles to the gallon. Any suggestions, or is this as good as it gets.
This is mostly highway driving a 2000 rpms.

thanks
 

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2005 chevy trailblazer_ls_ext
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I'd say that's a little bit low, but in range.

BTW, this topic has been discussed SOOOOOO many times around here. Please - click on the search button. You will have many hours of reading! :)
 

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2003 gmc envoy_slt
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:tiphat Welcome :tiphat You have to remember: The XUV is the heaviest of all the 360 platform. Do you have 4x4? That also hurts MPG's.
 
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