A little background, probably more than needed.....I just got thru researching diesel fuel additive as I have a tractor that doesn't get used much, looks like there are two schools of thought on additives: use it, it helps, and not necessary it's snake oil... I decided to go with opti-lube xpd (highest rated in tests and no alcohol) since I don't use tractor much and diesel will have some summer blend diesel still in tank thru winter and it shouldn't hurt...… It got me thinking about gas additives for vehicles, …. I always buy gas from busy stations, ex new Kroger where I live, but don't but from Chevron etc. w/ treatment added to gas...… should I add gas treatment to vehicles, (or only ones that don't get driven much)? is this a two camp subject where some recommend and some say not necessary? If it is a good idea, guess I need to ask what is best treatment and how often? (does this need to be moved to fuel additive forum? I figured I would get more responses here first) Thanks.