It does say what Alvin shows, "add to a nearly empty tank". Well either way I had a full tank and I went ahead and added it. I figure it isn't going to hurt anything but it would be more of what Greg said, thoroughly mixed as adding gas will agitate the mixture. It may just not work as advertised or as well.
I added it last night and plan to go cruising a little tomorrow night, so I will see what (if any) difference I feel.
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