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I have always had good luck with Michelin LTX M/S2 or the new LTX Defender on a variety of Chevy and Toyota trucks. I have run LT235/85R16 and P245/75R16 with good success, both producing good traction and good MPG. Provides great traction on road (especially in inclement weather) and fairly good traction offroad (better than you would think) as long as you stay out of deep mud. If you go too wide for the weight of your vehicle you will be more likely to hydroplane and probably won't like the traction. I put 265/70R16 on my Tacoma (from my wifes 4Runner when we got it) as a stop-gap and do not like the traction compared to my LT235/8R16s that used to be on it. Her car now has better traction, getting new 245/75R16s (identical diameter and tread pattern, just different widths).
Do you know the rear end ratio or how many RPM you are at at 55 MPH? One reason to switch to a taller tire is to reduce the RPM for a given speed, but I have found this effect helps less than the lower rolling resistance so don't compromise your tread pattern for the sake of diameter (been there done that with 255/85R16). A good tread pattern in tall and skinny is your friend for good traction and good mpg.
At least that is my experience with five 4x4 vehicles and trial and error with more tires than I can count, I am sure others may have had other experiences.
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