Android Auto isn't working for me either (Nexus OS). I've tryed several custom ROMs and cant find one with working Android Auto... Maybe AOKP or RR?Installed last night, all seems good so far. No battery drain so far.
Has anyone had issues with Android Auto? The app itself works, but when I connect my phone to the car using USB my car wont boot up Android Auto.
Other than that seems pretty solid!