+1 with mknauss. My 7,500 gallon AG was likewise using 4-4.5 ppm per day until very recently up here in TN in order to daily target FC 7-9 with CYA at 60. That's when my pool water was near 90 degrees. I'm now down to about 2-2.5 ppm per day with the temp around 80 and CYA calculated at 40 and targeting FC 5-7. The demand seemed to drop suddenly in half in no time as the sun angle began increasing at an accelerated rate.
I also started noticing a quick drop in CYA from early August until now. It had stayed at a pretty steady 60 from May through July (now at around 35), but it's been very rainy up here lately. I've used the extra water to vacuum to waste a couple times, which may have accelerated my CYA loss.
I manually dose with bleach, aka LC, but manual dosers are also very keen to FC demand, because we reload daily and test two-to-three times per week to help us stay in target range, and so I sort of subconsciously do the math when I test and keep track of how much FC is being consumed, which helps us detect any issues as well.