Whichever cleaners I do use, I use whenever I get to it. Could be anywhere during an OCI. I posted in other threads but for me I never noticed any difference using Techron in my cars. One was a Corolla with a small tank and I would run it to almost empty when the cleaner was in. After some other BG products were used by mechanic and friend I tried the 44k. That did a make difference I could feel but more so document.
Maybe the Techron kept everything from getting totally clogged, maybe it just kept my wallet lighter. Maybe it needed a double dose to make difference for me but I didn't do that so will never know.
Like Rislone that members have said they double the dose to get the quicker cleaning they are looking for. Who knows. For me Techron as listed/dose is not on my buy or recommend list from my experience. YMMV.