I have a 01 Cummins,that was getting 22 mpg a couple years ago..I started dropping fast..It is down too 14 mpg now.starts great,but dont seem too have that fast take off anymore..replaced fuel filters,added lucas too fuel,..I did find a slit in the intercooler rubber tube on driver side. I put silicone on it one night too see if that was leaking.the next day. the silicone had a slit in it also..So Im going to order replacement today..Dont know if this will fix or not.Any other ideal..I have no Chips or mods.223000 miles.Not ran hard..Thanks

 

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Try here.... https://dodgeforum.com/forum/dodge-cummins-diesel-88/