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Oil is a consumable item your burning it at start up is definatly not a ring problem but thats not to say you don't have worn rings.
The smoke at start up is probabily valve seals or guides.I don't think thats where 3/4 of a quart is going there could be a ring issue also it just isn't showing up yet.
Driving habits can add to oil consumption as well as engine wear.And the older the oil is the faster it will pass into your combustion chamber and burn off.
The botXXXXX XXXXXne is your engine is showing signs of wear and repairing it propperly would invole diassembly and checking these parts for wear. this is something you will have to weigh against the price of a new ride.
The type of oil you are using may slow this down. What oil are you prasently using?
It's A "B' tech job as far as dificulty any good shop should be able to do a competent job. Anymore question on this issue please feel fre to post them
Thank you Regards