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3.7L vs 3.5L programming differences
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04-08-2007, 04:23 PM
usetosellhummer
Hummer Guru
Join Date: Mar 2005
Posts: 3,356
Re: 3.7L vs 3.5L programming differences
I had the 06 now have 07 and mpg is better! Can tell right away just on my normal daily driver routine of fill-ups. weill get stats after full breakin
thanks for the data
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