2006 GMC Sierra 4.8 fuel milage?

lonelylboy

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Im trying to get my fuel milage up. Im getting roughly 14.5 to 16.5 When I first got the truck it got like 20... I have a k n n air cleaner...I use Ams oil full sythetic with filter....I tried cleaning mass air flow sensor. ran lucas fuel injector clean threw several times. anyone get an idea thanks...
 
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