If you are comparing briands as I see here often remember. The machine that will always perform the best is the one running on high octane premium fuel from a good supplier like Chevron. This is most important with the small engines we all use. I learned this by experience. Every time my chainsaw came back from a tune up it ran awsome for about a week or so then not so much, every time, without fail when coming back from a tune up at my service mechanic. I asked him why and of course he said it run good untill you put regular gas in. It will never run as good as when I give it back to you with Chevron supreme in the tank.: Well how about that!!!