Lots of people have decided their own ratio and seem to have good results that way. I'm kinda old school and follow the directions on the container.
64:1 Exterior dewaxing
20:1 Cloth-upholstery cleaning
12:1 Carpet cleaning
9:1 Vinyl cleaning
4:1 White wall cleaning
4:1 Engine degreasing
The 12:1 mix, I have been using as a basic all purpose cleaner as well as for carpets.
Seems to be a very good product with no real problems in any situation I have used it. It is not the best smelling product I have ever used, but the odor does not seem to last long after using it.
Charles