Can you imagine going into a gas station with a sign out front saying gas was $2.59 a gallon, and when you went to pump the gas you first had to pay a $15.00 fee for using their pump, an $8.00 "lot fee" for parking you car in front of their pumps on their property, a $17.00 "roof" fee because there is an awning over the pumps, and a  $14.00 "snack bar" fee to cover the fact that should you feel the need for a cool refreshing beverage, you have the option of walking in and purchasing an Icee for $1.99?

I believe gas takes longer to heat the water but more cost efficient but don't hold me it.From google search:The average American shower uses 17.2 gallons (65.1 liters) and lasts for 8.2 minutes at average flow rate of 2.1 gallons per minute (gpm) (7.9 lpm).

They could go to Walmart and buy a 55-gallon bin to bathe in with hot water heated on the stove and take care of basic needs.

We have installed a tankless water heater so we can adequately supply all units with hot water as there was just a standard 40 gallon in place to handle the entire building prior.

They are typically around $100 and take time to replace so you may have to pay labor on that as well if you can't do it yourself.Note: older toilets can use up to 4-5 gallons PER flush.

I added 2 bedrooms and bathroom inincreased  my septic from 950 gallons to 2500gallons,spent 17 k in all.

Unless I'm mistaken there's nothing that would prevent you from buying a house with an oil tank that was leaking 25 gallons a day much less a decommissioned one.

The tenant contacts owner yesterday to state that they received a water bill for the month of June in the amount of $600 and it has to be paid by Friday. (60k gallons!!).  

The USGS estimates that the average person uses 80 - 100 gallons of water per day. 

As for propane, unless you are going to buy your own 1000+ gallon tanks so you can shop vendors for bulk discount pricing it won’t be worth your hassle to own a tank...and even then I doubt it makes sense.