Post your MPG's

And to add my numbers: 2013 CCSB 5.3 2wd 6L80E 3.42's stock + tonneau cover I avg 19-20mpg each tank. About 6k miles on truck now.
 
99 c2500 7.4 4l80e crewcab shortbed lt265/70/16 Bridgestone
Mpg 10-11 city
Highway 12-14
All stock besides magnaflow do/si muffler.
 
2005 Silverado RCLB
5.3 4wd - 3 inch body cranked stock keys 295/70/17 with 3.42 gears, Intake and header-back exhaust. Diablo tuner - 87 octane tune.

17 - 18 hwy
11 - 13 city



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my mileage went to shit ....with the winter gas i guess went from 16.7 too 14.25 .... and i haven't changed my driving style .... can anybody confirm shitty winter MPG's ?
 
you serious or joking? the 6 speeds in the half tons built '09 and later are 6L80s

http://gmpowertrain.com/Libraries/Product_information/2013_Product_Information_Guide2.sflb.ashx

i dont fuck with NNBS so i didnt know.

my mileage went to shit ....with the winter gas i guess went from 16.7 too 14.25 .... and i haven't changed my driving style .... can anybody confirm shitty winter MPG's ?

winter gas is normally better gas then summer IIRC except in diesel
 
ahhh ok well i am definitely seeing close too 8% decrease in mileage but i guess engine has to warm up in the morning when leaving so running a higher rpm for a few more minutes then it does in the summer
 
ahhh ok well i am definitely seeing close too 8% decrease in mileage but i guess engine has to warm up in the morning when leaving so running a higher rpm for a few more minutes then it does in the summer

Exactly.

Between more idling, and less efficient fuel it kills my mpg.


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I get like 18 or so on the interstate, haven't calculated yet. 6.2/6L80E 3.42 gears im guessing and at 70mph it runs about 1700rpms. City mileage isnt cool :iamdisappoint:
 
I can't for the life of me get any better than about 17 1/2 mpg. I do about 95% hwy driving. My truck's a '13 CCSB 4x4 5.3 AFM bone stock.
 
2002 GMC Sierra 5.3 LM7 (intake and exhaust) - Built 4l60e - 3.73 gears - 245/70/16 - 3/5 drop
City: 12-13
Highway: 17-18

on 285/35/22
City: ~11
Highway: 16-17
 
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