Do a compression test on all 4 cylinders. Note down the numbers, they should be within 10% of each other. If a few are down, drop a tea spoon of oil down the bores and the pressure should go up. This indicates worn piston rings.
To be honest, normal engine operation will use a bit as every car will burn oil because of the bores being sprayed with oil.
How much are you using in regards to miles?
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