What is the average Max mileage of 1998 Jeep Grand Cherokee Limited before it croaks not the mpg but the overall mileage?

It will easily pass 200,000 miles with normal maintenance. It's hard to come up with an average life mileage for these. My 1995 has 190,000 miles on it and the engine runs strong but I've had so many other problems with it that I'm getting sick of the thing. As an almost 20 year old vehicle with almost 200,000 miles, it isn't worth a thing on the resale market and if one more thing goes wrong it's going to become a field car.