JMo
There are 7 of us with XR650R's with varying mileages on but the highest is 34,000 kms which has included motorway, backroads and off road in Europe, Morocco, and UK trail riding and it does use a bit of oil at constant motorway speeds but nothing excessive like yours. He has kept pace with me on a KTM 950 at 80mph on the motorway in 30c plus heat on motorway to Italy without excessive oil consumption. (15 45 gearing is more relaxed on the motorway than what we use for say trail riding or desert in Morocco)
Sorry i can't help with your problem but more to say that they all don't do it. Good luck with sorting yours.
We all use semi synthetic oil, not full synthetic oil if that is of any relevance.
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