Okay so I had purchased a used savage xl and had to replace the engine on it. I have a gallon of odonnell 20% r2r nitro and a gallon of Byron's gen2 30% nitro fuel. I broke the engine in with the 20% from odonnell and now that's it's almost all gone was wondering if it is bad to switch to the other fuel or even jump up to that % of nitro. I've heard so much back and forth from people I would like a good solid answer from a expert. Would it be best to just stick to the odonnell it's whole life or can I switch up what fuel I run?