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Even though both have 3.08 gears, your diesel still has higher overall gearing. The gearing in the tranny is different and you have taller tires on the truck.
Anywho, another datapoint for you: My truck is a 4.8L V8 Auto, 2wd with 4.10 rear end. On good behavior (no hypermiling tho) I'm a hair under 20mpg. Weighs in a 5400lbs with me and a full tank of gas (according to the scales at the dump). I'd love to have a manual instead, but I couldn't track one down. They were like hens teeth apparantly in '03 (and no longer offered at all).
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