Took it to the KW Dealership in Chatt TN, and they put the air pressure to it and found no leaks, checked the front and back of the turbo no problem.
From there I went to Southeast Diesel and the put it on the Dyno Diagnostic Test and checked fuel pressure holding good, turbo psi good, pwr hp good, rail psi good.
393 hp to the ground
29 PSI of Boost
88 PSI Of Fuel
They could find nothing wrong and no Boost Leak.
Neither place could find anything and were left with me and them scratching our heads.
KW Dealership told me to run it a couple of weeks and if the mpg does not return, then bring it back.
When I first bought the Truck it did this, and I bought locking fuel caps and it came back up, but am not sure if it was something on the Truck now. That was back in Oct of 07.
Any suggestions anyone???
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