Thread: GMC HD2500/HD3500 fuel milage ?
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  #41  
Old 09-24-2017, 06:59 AM
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JustBen JustBen is offline
 
Join Date: Feb 2013
Location: Stavely, AB
Posts: 785
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Originally Posted by Rdamours View Post
I believe with the 6 litre on 2017/18 its the 8 speed transmission that should help out with the fuel mileage for that gearing.
Still stuck with the 6 speed. 8 speed only available on 1500.
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