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Posted

14.5 or so before getting my tune from jesse. haven't filled up since installing it.

Posted

With only 700 miles on my 5.3 I just got 14.3mpg on this last fillup. My dads 6.0 gets about 8mpg, with most of that being short trips and all city. I hope my 5.3 gets a little better once it gets more miles on it.

Posted

well i got a 99 serria reg cab 6 foot bed, 4.3 5 speed

city 17.5 with air

hwy. 23

with 5500 lbs trailer and race car about 15

just got the wife a 2005 yukon 4.8

15- 16 city

20 - 21 hwy

Posted
15mpg city

 

19mpg all highway and a high of 21mpg on a long trip

 

05' ext cab 4wd 5.3L w/ 3.42s

 

 

 

My '05 gets exactly the same. I also have an '03 Z71 extended cab which is about 2-3 mp/g less on all counts.

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