Hard to say. Condition of the interior is usually the best indicator of mileage. If the seat bolstering is all smooshed and everything is beat up in general, then it's probably higher mileage. Paint doesn't tell you squat, because if it was kept outside, it's going to look like crap regardless. Like someone else was saying, hit that with some rubbing compound, and keep it waxed, and it will probably still look pretty decent for a while. The roll bar and console hacking would make me a bit nervous. Any underhood shots? With 28K, it should look pretty much undisturbed; should have that little boot over the dizzy, factory plug wires, etc.