It is truly amazing what a difference
water chemistry makes. I don't think I use even a tablespoon of 2-in-1 in my SQ FL. And with the Original I just pour it until it's a little bigger than a quarter. And that's with a Culligan water softener. With an extra rinse there's only a barely detectable scent left in clothes. Barely anything.
But today I did some laundry for my mother in a different State, old school full fill top loader, harder water, no water softener, and I ended up pouring in more than 2/3 of a cap before I was satisfied. The water was slippery by then but still no suds until some faint suds started after 15 minutes. Even with a second rinse the scent was very strong. It filled her 1 BR apartment and the clothes smelled strongly. It smells so good.
Anyway it's amazing how the dose can vary depending on water quality, machine, load size and soil level.