does it matter if i use 2 differnt fuels on my rs4?

i mean i use a whole tank of this purple fuel then go off and use another brand

Not sure what an rs4 is? What % of nitro is the purple, and what % is the new fuel? There is a rule that says it's usually OK to go to a lower nitro fuel than the engine was broken in on as it gets older, but not a much higher one. If you need a more definitive explanation, I can go to my reference material. Let me know_Bob

i just mean can u use different brands of nitro fuel for nitro cars