If its not on the floor where you last parked your car then you are either burning it or its going into your cooling system.
When you first start it in the morning does smoke come from the exhaust? if yes the possibly valve seals are worn.
check for crankcase pressurisation, undo the oil filler and see how much crankcase pressure and fumes are emitted, lots =rings also check that the pcv valve is not blocked as a possitive crankcase presure can force oil passed worn rings. also do a compression test.Both wet and dry a wet test will tell you if your rings are worn or not.To do this have engine at running temp, remove plugs, fit a compression tester in spark plug hole, open throttle wide and crank motor until a maximum pressure is achieved. do this with all cylinders and record the results. Then squirt a little oil into the spark plug hole and crank engine over as before.Do this with all cylinders, record results. If the reading is substantially higher that the first test then your rings are worn
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