I happen to be on vacation in Lansing MI when I started to read this discussion and since I have time would try the diesel Kleen sold by Walmart. I was getting 17.5 mpg on the trip here from Duluth, mn. After putting some of that in my average is up to about 20.5 as the computer is telling me. It has been quite accurate. Will not know for sure until I fill up again. This is not towing just driving with a few things in the back.
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