Never been a fan of additives other than Techron and meth. Nothing for lawn equipment especially since I went all electric.

If a vehicle is going to sit for an extended length of time I fill the tank and keep it filled with gas that has no ethanol. Then start it once a week or two and let it get to operating temp and then drive it around the block a few times. Depending on its makeup, gas will start degrading in 1 to 6 months. Ethanol degrades faster. I use Chevron gas which is 93 octane for daily driving.

No oil treatment either. I change oil and filter every 5,000 miles or so. All vehicles have always passed the stale gas smell test and haven't had any problems.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas