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Hmm, that is a small current draw and I suppose it is a lot of work. I was just thinking about people like myself who sometimes park their cars for several weeks at a time and might have battery issues.
Perhaps sleep could be implemented through a user-selectable menu option. Write the current RAM to EEPROM and basically shut down. Then some signal (keyed power?) could bring it back to life when the car is started again. I wish I had some better 'C' chops to try and tackle this.
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