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No EGR on the 7.3 and the early ones did not have a cat plugging up the exhaust. Intercooler will help with power especially with a tune. There might be a mileage tune out there. I get 17 with my NA 6.5 GMC with 4.56 gears and a 30% overdrive. Gears would really help my mileage but I don’t have much power so rpm is king for me.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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