Scott Scheel is another who has a commercial property academy and teaches the usage of a 50% rule.

It's led me to discover home monitoring systems like Eyedro (for electricity) and Flo (for water), where you can see the individual usage for the mother-in-law suite.

Colored is required to pay all common area utilities unless the usage is below the de minimus levels. 

@Tiffany Drahonovsky making a comment about your car is just inappropriate and gives you an insight in her believe system, which is you should pay for her housing, because you can aford it.While I am all for flexibility and working together to find a solution, especially with CV, you probably should start looking for a new tenant.

His insurance was way too high, and we are putting shower blockers in the shower to prevent high water usage which will reduce the expenses.

I'm convinced that, until they make an internet connected submeter (that can simply glob onto a wifi connection) that just publishs usage (and doesn't try to bill people), there will be no cost effective solution for small multis.  

The truth is, he gets paid for the licensing and usage of his name (nice royalties hey Mr D!)

My rental property has the meter in the basement so the electric company "estimated" my bill based upon a normal usage house.

It also brings with it additional considerations: in some cultures it is inappropriate for un-related men and women to share the same living space, washrooms, etc.  

3) Lead-based paint usage fell of a cliff in the 1950s, as the water-based paints became good enough to displace oil-based paints.