[ecomodded]

From what I have read and gleamed it should best to accelerate somewhat quickly , using more engine load / throttle.
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My thought on it is you don't have to press the throttle near the floor , instead press it far enough that the truck will use the gas to accelerates with, don't over press it , for little to no result.
keeping the gas flow in sync with the 'pick 'up' of the motor.

Also you are going to want to hit a rpm that induces your gear change, so if you change gears at 2300rpm you'll want make that your goal, and not race on past it.

*Get road tires on rims*, and swap to off road tires when your going off road

Changing to road tires should save at least 5 MPG and would extend their life for years and years. I have to suggest the tire change as it will save you a fair amount of gas..