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I am new at this and this website, I have 2006 Duramax it gets good economy when not towing but put a load behind it and it goes to about 12 or less. I am looking at chips to put in but all I can find about them sounds like the advertisement not a comparsion. can someone help me ? or point me in the right direction........
My 2006 K3500 is the exact opposite. Empty never sees over 16, but does 11 average towing 25' gooseneck and hauling loads which I consider acceptable.
I am upgrading to Kennedy Diesel's tow/economy tune and plan to put it to the test hauling boats cross country. We'll see how the averages are, between a stock 7000 mile thrash, followed by the same 7,000 with the same boat/trailer combination.
More soon...