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22 MPG is very good for the 4X4 model.
The WAI normally helps with true TBI, but it will boil down to the type of driving that you do. If you hypermile and do not have to climb a lot of hills (need for power), then the WAI will boost your MPG.
An electric fan will also help, as the factory clutch fan causes a measurable loss in mileage. By the same token an underdive crank pulley will also help, as would converting from power-steering to a manual steering box.
If your engine comes with a factory oil-cooler, and you do not do any towing, then remove it. Hot oil gives better mileage.
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