Update to my original post. I had the oil changed since my original post at the same dealership, synthetic blend. I noted it was about 1/8" below full mark after the change. I have driven approx 1000 miles since the oil change with no noticeable use of oil. There was no towing in those 1000 miles but it did involve a round trip to Jax Fl running 70-75 at least part time. We will be towing TT to the NC mountains in a couple of weeks. Guess I will find out then if the oil loss was due to the "stress" of towing. I suspect there will be some oil loss, but we shall see. Will update when we return.