Depending on where you are located, you have to worry about the AC system. The evaporator likes to start leaking and trust me, it is NOT a cheap fix.

As far as the mileage, ask for a carfax. Chances are, the odometer has stopped working due to a broke gear inside the instrument cluster, it's an easy fix, but if it's broken, its harder to get the actual mileage.

If you hear creaking or cracking in the front suspension, you'll be looking to replace the spring seats and/or strut mounts.

As far as mileage, I have a 97 NA with a 5 speed, and down here in the HEAT Im onlye getting about 26-28 on the highway and 19 or 20 around town. Not terrible, but it gets better without the AC running full blast.

Expect to put atleast $1000 into it after the purchase, unless it's immaculate. And budget $1000 a year after that.

Good luck, and let us know what happens!