I decided that I would only use Shell V-Power Diesel. It is normal diesel with an additive injected into it at the pump. If you look carefully at the pump you may see a small white line, similar to an ice maker water line. I believe the additive sits inside the pump housing.
I have no idea who replenishes the additive, or if the V-Power pump will continue to dispense if the additive reservoir is exhausted, but I'd like to know.
But here's what I referred to last night:
There have been tests done on the best diesel additive.
Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums
Fuel Additive Test - Ultra-Low Sulfur Diesel - Diesel Power Magazine
So to save me from the hassle of measuring and pouring I'm just going to use V-Power and collect a few more Air Miles. Surely the folks at Shell are smarter than I am when it comes to pouring stuff down my tank.