My brand new Si had same symptom as your car and had to fill up the full bucket of coolant twice in 3 weeks of ownership.
I took it to the dealer and found that water hose or coolant hose was loose and it leaked the fluid which ended up damaging some belt and some other pieces which I can't remember the names.
Yes, my add coolant light was on intermittenlty as well and the engine temperature stayed normal.
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