Do it to it man. I have written out all the possible chemical reactions that could take place in instances of my additive brews, and most if not all the related compounds that would be produced are even more potent at cleaning than the initial additive was. This would worry me if there wasn't the looming worry about "gumming stuff up" or clogging "things". I have done octane studys as a mini blanket to worry about these issues as adding an oil will lower the octane. If you put yourself at too low of an octane, then you would be causing even more problems. Think about it, you would see the gumming if you tried 10% (1.2 gallons in your case) of soy oil in your tank, not an amount several orders of magnitude smaller. Plus, you're cutting the MMO with it which is a good thing. As long as you put it in the tank before you fill up, adding amounts as small as you are would go heavily into solution and would NOT come back out when you don't have the car in motion (garaged or parked overnight). I have done pilot batches with all of the additives I use, and I am very very happy with how things worked out. So, no offense, but God does know what I am adding, as well as myself. I am down the road, the engine runs like new. 105,000 on the engine, about 15,000 with the additives. Spark plugs look brand new. No blockages. No leaks. No fuel Dilution. No Oil consumption.
Could this be possible w/o additives? Yes, even in a GM engine.
Is that fun for me?
NOPE.
Cheers,
Ryan