Adam
Sorry for not getting back to you earlier.....
8oz per gallon is plenty, 10 if you think you need a little kick. Any more and 1: wasting product and 2: it will foam.
Do NOT let it dry on the tile and some porcelins may "stain/set" permanently.
I just cleaned a residence and basically let it dwell for ummmmm 1 min. , no scrubbing, turbo'ed at 1800 and collected $$$$
Sooooo easy......
Yes you can clean concrete, they also have a slightly acidic cleaner that is awesome for concrete.
If it's heavily soiled with grease, I actually use......don't shoot me..... Purple Power from ChinaMart first. It actually works good.
Call Ken Horton @Western Concrete as he is a wealth of knowledge on the shorebest line as well as a distributor.