Thanks for the insight! It’s quite helpful. New bike arrives next week and I’m about to get the sportsman flat out ready for use.Well, for reference its 16 oz for a fat tire. I was told by Flatout for your typical 26x2.5" tire to use 8 oz. For a portly 29er - 29x2.6 - to go somewhere in between. Say 12 oz. Yes you use a lot but remember also you want this injection to last the life of the tire and over the years some is going to come out. Also it spreads to a film that is tenacious all over the tire interior. Flatout doesn't seem to clump on one side of the tire over time like Slime does.
Back when I was using Slime on fat tires, the general community wisdom was to double the recommended dosage. I had one flat where I needed every ounce of that extra.