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foamypirate · 05-26-2010, 04:24 PM

My father's 08' GMC 1500 CCSB 4x4 gets around 20-21mpg highway, but some of that may be due to the AFM (active fuel management). In-town is another story, averaging around 15-16mpg.

05-26-2010, 04:24 PM	#16
foamypirate Registered User Join Date: Apr 2009 Location: Pflugerville, TX Posts: 594	Re: 5.3 vortec gas mileage question My father's 08' GMC 1500 CCSB 4x4 gets around 20-21mpg highway, but some of that may be due to the AFM (active fuel management). In-town is another story, averaging around 15-16mpg. Last edited by foamypirate; 05-26-2010 at 04:25 PM.