Thread: 6.6l duramax / allison combination
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Old 10-24-2012, 12:39 AM   #3
bethandkevin
Montana Master
 
Join Date: Mar 2012
Location: Davison
Posts: 786
M.O.C. #12331
Ours is a 2008. We got 12.5 average on our 1300 mile U.P. Michigan trip this summer. Never set the cruise over 64 mph.
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