not too long ago engines would require a more lubricated fuel for break-in, but from what i have read lately about engine manufacturing and new lubricants in todays fuel evryone is saying the best thing to use when breaking in a new engine is the same fuel you plan to run in the car. I did just that when i broke in my new TRX 3.3. although the fuel i use is trinity monster brew that DOES have 18% lubricant. all in all you should be alright with byrons. as long as it is a new gallon and not something that has been sitting for awhile. hope this helps. if you have anymore questions, feel free to ask.