Leaf Blowers

I just purchased a 125B blower. I have a question regarding the information in the manual on fuel/oil mix ratio. I plan to use ethanol-free gas and synthetic oil. I have a 2.6 oz 2 cycle synthetic blend bottle that I usually mix for my weed eater. Husqvarna says that the ratio for this blower should be 50:1. The little bottle says "suitable for use to safely mix in any of today's two cycle engines that require a 50:1, 40:1, 32:1 or 16:1 mix ratio". How can that be true? If you mix something 50:1 it is definitely NOT 40:1, so should I put more gasoline into the container to make sure it is 50:1? I guess I would have to do a math calculation, but I wanted to check with you first. It is confusing. I know I should've probably spent the extra money on the Husqvarna oil but they only had LARGE bottles for sale and I was short of money after purchasing the blower. Thanks for any light you can shed on this problem.