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A lot of car sites make reference to homebrew gasoline, using either xylene or toluene to increase octane rating, and an oil additive to "save rubber parts." While skeptical at first, I thought I'd give this a try using formula's readily available online. I've ran several tanks of 10% mix with great results. I have noticed that my bike (K4 750) idles smoother and generally feels "more torquey" throughout the RPM range. The bike runs a few degrees hotter but is still within normal limits. Has anyone else done this with good...or bad...results? Below is a chart I made in excel if this is something you might want to try this yourself. MMO refers to Marvel Mystery Oil

 

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I suspect over time, you will see fouling in your plugs and combustion chamber. Adding a lubricating oil to gasoline is not really a very good way of increasing octane. And increasing octane without corresponding compression modifications isn't beneficial, either.
 
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