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There is increased oil consumption when you used forged pistons. They burn more during cold starts because of the rate of expansion when compared to stock cast pistons which have low expansion.
Having said that i would do a leak down test both hot and cold and compare. At the same time i would inspect your plugs for signs of consumption to see if 1 cylinder is more fouled then the other.. and while the plugs are out i would inspect the condition of the cylinders with a bore scope to look for signs of scoring.
It would have to be a pretty large leak to externally leak out 1L/1000km.
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