Here's what the ONR bottle I just received about 2 weeks ago has to say:
For Clay Lube:
2 oz : 128 oz (1gallon) dilution
or....
0.375 oz : 24 oz dilution
For Quick Detailer:
6 oz : 128 oz (1 gallon) dilution
or.....
1.125 oz : 24 oz dilution
For ONR wash:
0.5 oz : 128 oz (1 gallon) dilution
or....
you shouldn't be washing wih 24 ounces of water so I won't bother with the conversion

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According to Optimum a capful equals 0.5 ounces. Personally, I prefer the shot glass method for measuring my ounces :2thumbs:.
I checked out the Optimum forum and it looks like there used to be a version of ONR concentrate that was 'brown' in color and had different ratios. I haven't heard of a change in the dilution ratio's for the 'blue' colored ONR concentrate, if someone has let us know.
I'm sure you know this, but in about 4-7 days your mixture dilution will turn clear, but don't worry it's still good to go.
Good Luck