May 2022 to November 2022 I used <100 gallons, then used ~550 gallons between Nov 2022 to April 2023.

This year I've used ~170 gallons between June and mid-December, and last I looked at my tank a couple of weeks ago, there's another ~150 gallons used there.

House is ~2600 sq ft, kept at 60 F constant. Except for when we had a visitor from the tropics who needed their room at medium rare temps for a few days.