I allow fish tanks up to 20 gallons and charge $30 a month.

In this case I suggested a 10,000 gallon water tank with just one of those meters attached to it.

This resulted in approximately 600,000 gallons of water wasted and nearly $12,000 water bill over the course of 2 months.

On top of that, they decided to sabotage the plumbing by dumping gallons of cat litter in the tub drain.

That would burn through around 10,000 - 15,000 gallons in 24 hours.

I am in KC last few days gas is 2.75 a gallon.. gas is still 4.50 a gallon in OR WA CA if not higher in some spots

Unfortunately, in CA driving the train is a lot more expensive, as our fuel's touted to go up at least .46 a gallon, and it's already $5.

My triplex has a ~6'x8' enclosed area for trash cans (55 gallon rolling receptacles).

In San Diego I recommend descaling tankless annually and this is significantly more effort than draining 5 or 10 gallons from a tanked heater and changing anode every 5 years (by the way always use impact wrench to extract old anode as breaker bar can move water heater messing with other connections).  

Gas $10 per gallon.