The laws of thermal dynamics are limited, and Cummins is a great engine, or I would not have pulled my 6.5L and replaced it with a 5.9L. However, that said, my mileage was good on the 6.2 and the 6.5L. Empty and loaded. By the time my 6.5 was pulled, it was no longer stock. I had lower-compression pistons, larger turbo, ported heads, with ceramic coating on exhaust passages and manifolds. It ran awesome. Simply not dependable. For those who spew the conventional rhetoric falsely, I will call you on it. A well tuned 6.5 would get good mileage. It was not designed to pull heavy, nor would it. My well tuned - overbuild 6.5 lasted JUST 44K. By no means will I endorse the 6.5. It is a piece of crap, but that piece of crap was capable of getting good mileage when the timing chain was not worn and it was tuned. My Cummins pulls awesome and get satifactory mileage. I could lie and say it gets better, but it gets good to great milege, but not awesome. Awesome would be 20MPG or better. Of course my Cummins is tuned. I could not be more pleased. My Cummins now has 380K on it, and still runs like a champs and my 1 ton will pull a much as my medium duty truck, but seriously - I like to stop with a load.
I have also owned one of those little VW pickups that 4400 were made in New Cumberland PA in the early 80s. All the little diesels get 50MPG, spew the conventional wisdom. Bullshippng. 43 tops. I have owned 9 of them. I re-engineer the one I own now, and struggled to get 50, but just ask around, they all got 50.
your statement is merely repeating what others have said, and does not help Walter at all with his decision. I personally did my conversion from 6.5 to 5.9 myself in 2004, and it is no small task, and for that model hard to do right. Simply, there is not enough room for a fan, radiator and an aftercooler. A minumum 2 inch cab rise kit is required to close the hood, and every cross-member has to be moved. DoAble, sure, more than one converted. Worth it , abosolutely. My truck drives great, and is very dependable. Walter got a great deal, if I remember the price, and has not broke the bank to get it running. Obviously, like many of us, he does not have unlimited funds, and asked what can he do reasonably priced to have a dependable truck. Parroting that the 6.2/6.5 is the worst...Really, no help there. Yes you are a troll: PretendFARMER.
"The 6.2L/6.5L Detroit diesels were among the worst diesels ever produced. If your getting similar mileage out of a cummins and not beating it, there is something wrong.
Not trying to be a troll, so sorry if I'm coming off like that. I knew a guy very well who had one of those rigs. Complete POS, terrible mileage, gutless and constantly had to fix it.
If your truck is in as good of condition as you say, I would consider selling it and getting decent money while you can. Replace it with a Ford or Dodge diesel.
This post was edited by PretendFarmer at 05:41:09 11/13/13.
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Today's Featured Article - It's Alright Where It Is! - by Anthony West. I have a tale of a different kind to tell. Whilst rooting in the hedge bottoms this week I had cause to visit Chapel lane Farm, the home of an eccentric gentleman by the name of Austin Kendall. I had heard rumours that an old Case Model C was languishing away in the back of one of the outbuildings there. So off I went in search of what would turn out to be a very rare and unusual tractor. Mr Kendall is an excitable chap to say the least. He is amongst the last of a dying breed of farmer who
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