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Id say the early 90s pre computer control 6bt was best for power economy but the 7.3 from 99 to 04? Was amazing other than the 4r100 it was commonly matched to. The Dodge never offered a better slush box back then.Didnt the suburban line drop the diesel/3/4 ton options?
In all honesty in stock form the v10 excursion pulled better than the 7.3. With about 5k thrown at the tranny and some more cash thrown at properly adding another 100 hp with real custom tunes then you get some real towing. The Europeans are killing us when it comes to fuel efficient diesels. Just Google some om606 boats or souped up cars. 400hp or more with a 3.0 diesel isnt uncommon.I love seeing a diesel powerd inboard ski boat rolling coal!