Thread: GMC HD2500/HD3500 fuel milage ?
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  #35  
Old 09-23-2017, 02:56 PM
Rdamours Rdamours is offline
 
Join Date: Nov 2012
Location: St Albert
Posts: 809
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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.
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