To answer your question Mark, I grabbed my bottle and to quote the directions verbatim:
1. Pour 1/2 oz. Shampoo inot (<- not my typo, actually from the bottle) a clean bucket. Spray in water under pressure to activate foam.
2. Wet surface and wash from the top down using a natural sea sponge, wash mitt or soft brush.
3. Rinse often and dry with a clean terry towel, Microfiber towel or chamois.
Directions from my Wolfgang Auto Bathe:
Pour 1-2 oz. into a bucket and spray in a heavy jet of water. Wash car with a sponge or wash mitt. Wash vehicle from the top down. Rinse often to prevent water spotting. Dry vehicle with soft, terry or microfiber towel or chamois.
As you see there are no indications of how little soap to use or how much water to use. With that being said, I use 2 - 2 1/2 oz. to 4 - 4 1/2 gallons of water for all of my soaps except CG GlossWorkz. They recommend 1oz. to 4-5 gallons of water, I use 1 - 1 1/2 oz. to 4-5 gallons of water.