I'm not too concerned about it, knowing the exact brand won't nesessarily make it any better or worse. Like going to the gas station and filling your car. I doubt you are concerned about which refinery it came from. I tend to place more importance on results. I have used this fuel in both sport flying/pattern applications and racing applications with YS 4 strokes and my engines have not had the same performance ( idle, transition, top end ) with any of the other few brands/mixes I have tried. A good testimonial is that rather then have a local guy bring fuel to me, I opted for a 4 hour drive to go pick up my current mix.