I would use an lubricity additive year round with a 24 valve and only use an anti-gel additive with a 12 valve in the winter. I run #2 with additive in the Montana winter without gelling problems. Most stations don't give you a choice, you will most always get a blend or #2 plus additive in the northern winter. I would still add the recommended amount of additive anyway just to be on the safe side.

Was reading about cetane boosters recently, most are made with nitrous oxide as the main ingredient. As most racers know NOx is usually a gas. Apparently it wants to change back from the liquid form to gas in your tank in the process causing precipitates that form sludge in your fuel system. Not good, plus you lose the cetane boosting properties in just a few days.

This answered a question for me, I had gotten mixed results in mpg gain using Power Service cetane boost (silver bottle). After reading the NOx article I now realize the mpg gains were only on tanks where I drove straight from one fill up to the next, when the fuel was allowed to sit in the tank, no gain. So now it appears beside possibly plugging up your system that cetane boost additives are a waste of money unless you use the fuel fast.