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Today at work I downloaded the trip info from an ISX 550 HP, 1850 ft/lb torque in a Peterbilt 379, 18 speed. Pulls heavy haul Canadian super b-train weights (140,000 lbs) over the biggest elevation changes on this continent and cruises at 68 mph:::: 4.8 MPG (US).
Smoky old 7.3s (or 6.9s or 6.2s or 6.5s or whatever) are the result of worn out fuel system parts...pumps and injectors that need serious attention. Bluish stinky diesel smoke is fuel that never really caught on fire and did any work. The more there is, the more fuel you are basically pouring down the drain. This is completely different than black smoke exiting a heavily loaded diesel, which is caused by insufficient charge air...aka too rich. If you must, get a set of reman injectors and an injection pump. It will make a world of difference. But be sure to do a compression test first so it's not all for naught. A quick Google search has injectors priced at $28/ea and an injection pump at $415 = $639. Peanuts.
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