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FWIW, when I first installed the RA OMP adapter on my S5T2, I was adding the same premix lube to the gas at the typical rate Ted mentioned of 16oz per tank, which comes out to a ratio of about 128:1, fuel to oil. Did that mainly as an insurance policy, in the event my adapter install was all jacked up.
That first tank of gas rewarded me with a rather smoky exhaust, as the adapter was clearly working, so I was dumping more than double the necessary amount of premix into the engine. I continued to add some premix to the gas in the next few tanks of gas, but at much leaner ratios. Started at 8oz/tank, and eventually down to 2 oz/tank, while I tracked fuel consumption & premix consumption in the adapter tank so I could characterize it. The premix smoke/stink stopped being noticeable at about 4oz/tank.
After doing the math over about a dozen tanks of gas, it turns out the adapter (with my stock electronic OMP) delivers premix to the engine at an average rate of about 100:1. Given these results, I no longer bother to add any premix to the gas, I just top off my premix tank when needed.
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