A sticking aircon clutch relay will draw about 3 amps and a sticking rear heated screen probably 10+ amps, heated mirror maybe 5 amps. Even a boot or interior light left on ( 5 watts ) will draw almost half an amp. Car makers normally aim for max standby current of <200mA.
Do you have an alarm fitted ? alarms are notorious for their high standby current ( and your 0.370 amps seems about right ). Obviously an alarm still needs power when car is locked and key removed. The normal OEM immobiliser will not flatten the battery - we left our cars for sometimes 6 weeks and they still fired up first time.
A good clue is that relays are used to handle heavier current devices like solenoids, heated things and headlamps, it means that a small switch and thin cables can be used to handle the 50mA or so that it needs to operate the coil of the relay while the main relay contacts can handle 20+ amps if required, this means that if a relay is sticking closed the load will be quite heavy and will drain your battery in hours not days.
According to wiring diagrams that Springswood linked to Fuse 8 ( 16 amps ) feeds accessory socket and cigarette lighter, and power is removed when ignition key is out.
