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As long as it's a load range E tire, you will sacrifice no load carrying capability by going to a 215 85R16 tire, for example. That may give you a slight increase in fuel economy.
What about doing the PS pump on an AC clutch? Turn it off when you don't need it?
Being a 3/4 ton, it probably has a TTB front suspension right? If it has the beam axle, that would make it easy to do a belly pan. Even if not, you should be able to make one that bolts to the frame for most of the truck.
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