Standyne Power Boost (I think) is the complete name. Cheaper by the case. It's recommended for all of your points but especially in the winter or cold temps to reduce gelling. I dont think it impacted emissions or boosted cetane, and I dont recall any boost in fuel economy.

My personal experience was that diligence of maintenance on the diesel was of greater importance ie, fuel filter. Lots of the folks in the TDI club replaced their VW filter with a Caterpillar filter as it was " heavier duty" and could last 1-2 years. You also bring up a point with the cetane value. All diesel fuel is not created equally, especially when the US went to ultra low emissions fuel. Finding a local, high quality diesel supplier was a primary concern, but I found that the local Hess station was fairly good, though it didnt have diesel fuel at the same pumps as gas so you could spend time waiting behind tractors to fill up before you got a turn.

I guess the OP has already decided that he's sticking with "dino" fuel as it's known in the diesel world. Probably a good choice if you arent used to the quirks and pet peeves of the diesel world.

Ed