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  1. Preston

    MPG cut in half

    I’m suffering from some power loss and terrible fuel mileage. My 2015, 2500 series P/U, 150k, lml with Kennedy lift pump, Kennedy tune, mega filter and air intake. I just returned from a short trip 300 miles. I noticed some power loss and my fuel mileage is down to 6-7 mpg. Last trip was...
  2. Preston

    Engine oil

    What is the go to engine oil. 2015, 150k, 6.6 lmm I believe, Stock but Kennedy tuned, twin fuel pump, air box.
  3. Preston

    Kennedy lift pump install

    I got the Kennedy twin pump installed. Works good. I was not expecting the dip under a bed cross member. You cannot pull the old line out without either cutting off a connection or lowering the front of the tank. Lowering the tank was nothing. I don’t have a fuel cooler so that made it easy...
  4. Preston

    Holy crap guys

    I’m new to the forum, to the duramax and to diesel trucks. I was hoping to blend in and keep a low profile. I was hoping we could be friends but I don’t speak your language. Lbz, lmm, what, Would somebody please tell me where the acronym page is. So I can ask about A towing programmer for my...