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Discussion Starter · #1 ·
have a 2007 DuraMax 4X4 dually... info center shows 8.9 to 9.2 mpg towing my 11,000 horse trailer...and 11/12 mpg not towing. Can someone recommend a fuel saving chip that really works? One person recommended Bully Dog/triple dog model... I have no idea or experience on any of this stuff. I just feel this truck should get better fuel mileage with or without towing.
Thanks so much....
 
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