Welcome, that really is nothing mileage wise!! I have a 2008 with more than 200k miles, only mechanical issue I have had is a leaking T joint in the cooling system (leaked Coolant onto the ignition coils), a retracting door step motor failed and the wire to open the driver window rusted and broke, preventing the window from closing.. all where easy fixes and quite cheap to repair, you should get plenty more miles and years out of that expedition. Enjoy it, they are fantastic cars/trucks.