WTH? Why can't I track long-term water usage in gallons?

WTH? Why can’t I track long-term water usage in gallons?

I use the very nice RTLAMR Add-on and it gets usage from my water meter correctly. But since I live in the US, the units of consumption is GALLONS, not cubic feet.

I know using water is different from other utilities that are energy-based (like electricity or gas) but from a billing perspective, my water bill is just like those other two in that I have to pay it every month and I want to track it every month.