Peter.470

Hi, I am closing a deal on a 2005 lexus gx470 for 20'000 dollars, taxes in. The current K of the car is 103k. I have the following question: Is it a good buy? I know lexus is a reliable brand, but should I be concern with the high K? What is the maintenance cost for this car, ... Oil change, break change ...? What sort of gas milage would I get? Thank you all forthe help.