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I have a 2004QC 3500 5.9 diesel,2X4,LB with 99500 miles on it, so assume it is broken in!!! I get 20mpg arond town, 23-26 on the freeways doing 1700rpm or about 62-63. Towing on long hauls like 1200 miles to Yuma I get about 13mpg with same rpms using cruise control. I looked at the variou chips available and most said with the tuner, I also needed gauges,bigger trans pan, and probably need larger exhaust pipe system. So after some research I went cheap, and many comments, I spent $50 for a DIY hydrogen generator kit. I did get a 25% improvement in milage, I had about 60,000 miles on when I installed it. I am a happy camper and if anyone wants to tell me how wrong I am forget it I am happy with results on my Dodge diesel
bod
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