I started realizing this after I had engines wearing out rather fast. I don't understand why HPI has those instructions.

Thanks for the response. I'm gonna go ahead and start mixing my own fuel. Was disappointed when I tested some of my byron rtr 16 % oil. By volume it has 13%. So they cheat you on oil...and probably nitro as well. Have no idea what synthetic they use... But they tell me its the best. Like every other fuel maker lol. I see the pattern. They are all winning. Not to say its bad fuel.... By any means.