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JohnC · 02-20-2010, 01:37 PM

I know you were mainly asking about 5.3's, but thought I would add my 6.0 mpg.

03 GMC Sierra 1500HD Crew Cab 4x4 w/106,000 miles. I average around 12mpg most if the time city driving, and the best I have got is 14.5mpg all interstate at about 75mph.

02-20-2010, 01:37 PM	#13
JohnC Registered User Join Date: Feb 2009 Location: Oklahoma Posts: 7,461	Re: Fuel milage survey I know you were mainly asking about 5.3's, but thought I would add my 6.0 mpg. 03 GMC Sierra 1500HD Crew Cab 4x4 w/106,000 miles. I average around 12mpg most if the time city driving, and the best I have got is 14.5mpg all interstate at about 75mph.