It uses to much antifreeze

Need to pressure test the system and check for any external leaks first and foremost. Sometimes you have to leave the pressure tester on for an hour or more and even over night in some cases to isolate the leak after the engine cools down. If you can do an over night pressure test without any leaks, then suspect a slightly leaking head gasket. Did the engine ever get really hot?

Crazy as it sounds the older recovery tanks are common to crack on the bottom side that touches the fender. Remove the two bolts when cold and just look underneath for signs of leaks or cracks. Happened to me and I bought aftermarket Dorman brand replacement.