They are pretty reliable.....sounds like a good choice.

Mileage 4x2, my guess is you will average around 18-19mpg with mixed use. Freeway will be 22-24 while city will be 16-17 or so....those are guesses though.

Interference engine...I don't believe so, but not 100% on that.

Timing Belt...I didn't change mine until 100K and it was still ok. I would never really push it much past that. The manual suggests changing at 60K, so see if the previous owner did..if so, I would say 100K after it was done is reasonable.

Trans: Not sure. If it is auto, it has a GM 4L30E trans. Not sure how well these are...they are ok, but do eventually leak and go into limp mode. I would think you have at least another 100K out of it before those problems. I however have a 5spd so I am not all that familiar with them.

Electrical problems aren't very common on these things.

Fluid. really nothing special, since you don't have a xcase all the fluids should be pretty straight forward. Y ou may want to use a 5W-30 Mobil 1 or something simliar...these engines develop a lifter tick...it's nothing to worry about, but a lot of people are freaked by the noise. 5W-30 Mobil 1 has been known to help quiet it some.

Good luck with it if you decide to go that route