The average water consumption is 140 litres/person /day.
This is about 30 gallons a day per person.

A garden hose will deliver about 15 gallons per min. If you use a hose pipe that will push you consumption quickly.

So a total of 45 gallons a day sounds about right for the winter as does 70+ a day during the summer particularly if you water your garden.

A water meter is not the best option if you use a lot of water, but if only two in the house it usually works out cheaper. Once you have a water meter you can’t get rid of it if it works out more expensive.