I baby all my equipment. For the small price of additives, to be safe than sorry is a no brainer for me. I have been using Schaeffer's Nutra for years, not only for its benifits in gas storage in fuel systems, but also lubrication. Recently I bought a carb rebuild kit from Mike's Carborator Parts (carborator-parts.com) for my new-to-me 1945 Chevy 1/2 ton restoration project. Specifically for ethenol treatment and especially for fuel systems and engines built before ethanol introduction, Mike swears by and sells "Ethanol Defence", "commercial grade gas and ethanol treatment", by Bell Performance. Their formula DOES NOT CANTAIN ALCOHOL and also addresses water removal. So I give my P-1000 gas a squirt of that too.
Distantly related; I also upgraded the lubs in my P-100 tranny and diffs. Have read in a few places, Amsoil products in these components will reduce cab noise (no, I'm not an Amsoil devotee). I switched to their Severe Gear 80W-90 oil in the 2 diffs and Chaincase and Gear oil in tranny. Yes, I noticed a reduction in gear noise immediatly, of course indicating less friction. These products are covered by Amsoil's "Warranty Secure" policy, guanteeing their use will not voild your factory warranty.