Google App & Google Play Services Draining Battery in Cyanogenmod

I have an old Sony Xperia Z I want to use in my car to use Spotify/ Google Maps/ Google Navigation/ Android Auto. The phone is running Cyanogenmod 13.0-20161219-NIGHTLY-yuga / Android 6.0.1 (Marshmallow). There are hardly any apps installed and I've got pretty much every single power saving feature switched on but the battery is still draining in a little under 24 hours. Google App & Google Play Services make up the bulk of the battery usage. I've setup the phone to only wakeup when it's charging and go to sleep when it's not - so this battery usage is happening when the phone is (theoretically) asleep. To complicate things Cyanogenmod is defunct and LineageOS doesn't have support for the Sony Xperia Z. Is there a known issue with/ fix for this battery drain? Or should I install another custom ROM (and if so, which one?)