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Old 01-23-2013, 12:01 AM   #37
Dalaigh
Canadian Trucker
 
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Join Date: Nov 2010
Location: Sarnia, ont canada
Posts: 648
Re: My 2012 GMC Sierra

Quote:
Originally Posted by piecesparts View Post
I stand corrected, I was under the understanding that they were. I will say that the increased goodies and the heavy duty suspension and without a doubt, the gearing is an impact on the fuel.
Actually you can option a 5.3 Z71 with 3.08's, so in some cases they should be better on fuel.
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