In under 4 years/50k miles battery has been changed 4 times. every time the cause is a bad battery and not a draw. there is an underlying issue with the mkz electrical architecture. dealer says this is a common problem.
I bought a new 2015 lincoln mkz. i took the car into the dealer for some routine service and mentioned that the single back up light is way too dim. the service department said that there is no adjustment to it. no accident just something that i noticed when backing up in the dark.