You can have good compression rings and poor oil ring function at the same time. The poor oil rings will just not scape the oil off the walls and it lands up being burnt. Or it is just going by them at a greater rate than design. Or even worst the excess clearance in the piston lands enables them to become minature oil pumps. At a thousand miles per quart you just might notice a difference in tailpipe emissions if oil is being burnt primarily. But I suspect not very much and you would have had to own the same engine in better condition to even risk an evaluation based on that. At 200-400 miles per quart the emissions become pretty obvious. your consumption rate appears to be increasing pretty fast. One might consider driving it for a time just adding oil until it is more clear cut. That is if engine is starting and running reliable right now. Another quick and good test in your hot part of the country is to change oil to a straight 40 weight or 50 weight oil. Perhaps a gallon of each if it makes you feel better. If oil consumption drops in half it probably is the engine rather than turbo bearing related. Pete is also right the seals could be making a contribution as this engine has had one ring job already and if they did not touch the head those seals might be getting tired as well. Again this might be a problem partially caused from a little deficiency here and there. Using a thicker base oil will define it somewhat as a diagnostic tool. A straight 40 or 50 weight has so much more viscosity than a multi grade oil in actual service it is almost unbelievable. Really helps seal thing partially up. If blowby drops way way down you pretty well have your answer. If nothing else it should rule out or condem the turbo seals as a major contributor in my opinion. If it is the turbo seal I would expect only a slight reduction in consumption with the heavier oil. If it is the engine I would expect a doubling of miles per quart burn ratio perhaps even more. Post some information down the road for everyones benifit. There is another test as well come to think of it. When turbo is cold take off ductwork and feel for excess play in bearings. Not conclusive but really worn bearings are harder to keep the seals working well. At least everything mentioned is pretty cheap to do with no expensive or difficult substitutions in the program. I like cheap somewhat meaningful indicating tests myself. Perhaps not the necessity to do them though.