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Old 09-11-2016, 11:09 PM   #24 (permalink)
Studying Brick economics
Andrewhans's Avatar
Join Date: Feb 2016
Location: Kenly, NC
Posts: 29

Tahoe - '04 Chevrolet Tahoe LT
90 day: 12.27 mpg (US)
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Originally Posted by cosmick View Post
You should actually have less aero drag than my 06, didn't read which engine you have, nor axle ratio, nor tire size, but with a 4.8 and 3.73s you should see 23 if you were 2wd, and you may want to try removing the front shafts until winter. With a 5.3 a 3.42 gear should also do 23.
I think the AWD is costing me a lot but I have no way to confirm it. I can't remove the front shafts because the transfer case has a viscous coupling with a 40/60 split to it. Without the front connected the transfer case would burn up within a mile or two. I have seriously thought about buying a used 4x4 transfer case, installing it and just making it stay in 2wd.

5.3 engine, 3.73 front and rear, 275/55/20 tires. The wheels are 20x9's which is a factory tire/wheel combo on newer GMC Sierra's.

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