have a small landscape business plus a rural farm so i run a lot of high dollar 2 & 4 stroke engines. use stabyl & ethanol treatment (this is not about what additive to use). have been told that premium gas in general will outlast regular in shelf life. if so, is this difference negligible if additives are used? any other reason to use it for small engines?.....anyone out there use premium over regular for this application & why? thx in advance