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I have seen claims on the internet of 35-40 mpg with a 4bt in a wrangler. If the price is right and a new engine is needed anyway, I would say its a worthwhile swap. I could only get 15 mpg with my 4.2.

I think that is the same motor used in the International Scout diesels from the 80's. There are probably Scout forums that will have alot of useful information. When I had my CJ-7 , I watched those tugs on GL hoping for a cheap one to be a donor on an engine transplant, but they always went for...