What oil is best? and what ratio?

[Loony661]

Are you saying gasoline quality impacted the ability of Techron to work?

In a roundabout way, yes.
I was vague, but should have asked if you think that different regions with different gasolines are the reason for the difference in results. I am aware that gasoline and its additive packages vary widely between different regions (think Deep South, Midwest, and Up North) and also from different refineries. So since not all gasoline is the same, I’m suggesting/asking that the results of adding a product would not be the same as well.