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Originally Posted by Target70
This ^, I was wondering the same thing. It would make sense if the ecu normally goes into a standby mode when the car is off, but when I leave it on the datalog screen it always has up-to-date info from all the sensors, so maybe it is constantly sending/receiving when the oft is plugged in.
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Perhaps the fact that the OFT is talking to the ECU keeps the ECU awake?
That would make more sense than just the OFT draining the battery.