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I had a 98 GM 6.5L Diesel for 9 years, I was getting 16 MPimpG with this truck and went to the dealer on warranty and no results. When the engine Warranty was over I did the open 3" pipe exhaust, and made and installed a Mechanical Turbo Waste Gate Control. I kept the Boost at 8PSI Max. Well later I made a turbo electronic fooler and set it at Max 6 PSI, while the Mechanical controlled it at 8 PSI. The fuel Milage improved from 16 to 23 and the truck was like a completely different truck. I could beat a GM 350 1/2ton that weight 2000 LBS less on the line and could haul my trailer with a 2 MPG advantage. When I accelerated I just did not floor it because I knew the heat was building fast as the left manifold hi temp warning held me back. Not worst then when it was stock though. These trucks were afull for heat with no Intercooler.
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