Thread: 8.1 & Allison?
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Old 03-14-2016, 06:25 PM   #11
6spdg37s
 
Join Date: Feb 2016
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I heard they use alota oil and get like 8mpg I would go 6.6 duramax if u keep an eye out long enough you should be able to find a decent one. just my opinion
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