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If you have the 22 HP Brigs engine, you can use regular fuel with the marine additives in it.
One bottle of the marine additives will probably last for the life of the mower.
Bad Boy with Kohler. 27 hp I believe. I have a couple other lawn mowers for the little stuff, a 2 cycle weed whacker, 2 cycle chainsaw, four cycle rototiller and “push weed whacker”, and a 1960 John Deere tractor. The one that I worry about the most is the tractor, since it was designed for leaded fuel.
All I do with my mower is put in gas. No premium gas. Check the oil. It's always OK. Never put in Stabil over the winter. They start right up. If there's a problem, a little shot of starter fluid does the job. Never had major trouble with any of my dozen gas engine toys. Never drain any of the dozen tanks. Most of them were purchased in 2008 when we moved to a large lot. Oh, I tore down the carb on an Echo chainsaw to clean it up.
Start em, use em, put them away.
I just remembered. About 5 years ago, I bought a "rebuilt" TroyBilt edger with a B&S engine cheap at Lowes. Wouldn't start when I got it home. The grill on the rope starter housing was crushed and I couldn't pull the rope. Fixed it. Tore down the cheapo plastic carb and cleaned and blew it out. Started right up. The next time, two weeks later, no start. Use some starter fluid and it started. I don't think the carb and primer are well designed. Often gas starved when starting. Dies. TroyBilt blames B&S and B&S blames TroyBilt and alcohol in the gas. After two weeks? The design of the belt drive on the edger is terrible. Too twisty It broke after three uses.
The TroyBilt is not the same company as it was in the 70s-80s. Owned by a cheap mower company. Wouldn't buy one today.