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First, you can determine the original tire size yourself by looking on the driver's doorframe for the vehicle tire placard. It will also tell you the specified inflation pressure.
According to Tire Guides, it ought to say either LT225/75R16 LR C or LT245/75R16 LR C - both on 6.5" rims inflated to 50 psi.
The rim width is a problem. It limits the width of the tire to 245. Using a rim that is too narrow tends to wear the center of the tread and makes the vehicle a bit unstable - as in, it will tend to follow the ruts and grooves in the highway and makes the vehicle more sensitive to cross winds.
Also, the idea of fuel economy and off road capability is incompatible. If you want both, you need to be looking at a compromise - and we'll need to know how much compromise you are willing to make.
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