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Have you looked at any custom Tunes for the engine? What tires are you running, I may be in need of new tires in a year and do some heavier towing seems the Goodyears I have on my Tahoe swell and start to shake when I inflate them to 50psi after they heat up, backed the pressure to 44psi and all is fine. I am guessing you have the 5.4 hypertech makes economy tuners maybe something to look at.
good luck and share any improvements you find
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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