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Huck · 02-23-2010, 10:42 AM

A lot has to do with rear gears---My 2000 Z71 with 373 gears and 17" wheel/tires would get 18 -19 highway. My 2002 2wd with 373 gears and 17"wheel/tires does about the same but when I put a basic camper topper on the back--my mpg dropped 1.2 mpg due to the weight and wind resistance. My 2000 Z71 Tahoe would give me 16mpg highway --best case. All had the 373 tow package rear gears. Neighbor has a 2003 GMC with 342 gears and gets 20 mpg hwy.

02-23-2010, 10:42 AM	#19
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	Re: Fuel milage survey A lot has to do with rear gears---My 2000 Z71 with 373 gears and 17" wheel/tires would get 18 -19 highway. My 2002 2wd with 373 gears and 17"wheel/tires does about the same but when I put a basic camper topper on the back--my mpg dropped 1.2 mpg due to the weight and wind resistance. My 2000 Z71 Tahoe would give me 16mpg highway --best case. All had the 373 tow package rear gears. Neighbor has a 2003 GMC with 342 gears and gets 20 mpg hwy.