You didn't mention what you were wanting to achieve from using an additive. As for anti-gel purposes, I have used howes, power service (white bottle), and opti-lube winter blend. Never had a failure with any of those. I'm very skeptical of any claims of better mileage or power gains from any additive, but I did find this study pretty interesting.
Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums
I would take that test with a grain of salt...... its 10yrs old. Id almost bet every one of those products have changed since then. I know some arent even in production any more.
Something else to consider about that study, and I think proves the point about selling as much product as possible...
The U.S. Standard, in 2007 at the time of this study anyway, was a HFFR rating of 520. While I know all diesel tested would not match this, that was the standard. BUT.... they did not use this number when calculating the HFFR ratings of the products tested. Instead, they used the rating for "untreated diesel fuel" of 636. Why? Because it takes more additive to get a rating of 636, down to their "recommended rating" of 460. Who buys untreated diesel fuel? If you start with that 636 rating, you have to use enough product to drop the score 176 points. Thats a lot. If you go by the "U.S. Standard" rating of 520, you only have to drop the score 60 points... thats a HUGE difference.
Right now I am running 13oz of 2SO (1:333.1) and 4oz of Howes Meaner Cleaner (1:1000.1) in a full 34gal tank..... or, 1/2oz per gallon of fuel. The 2SO is good for lowering the score 97 points, and the Howes Meaner Cleaner lowers it 50 points, for a total of 147 points. Subtract that from the U.S. Standard of 520, and that puts me at 373.... well BELOW the recommended rating of 460. Even if you use the untreated rating of 636..... subtract my 147 off that, and I am still at 489, which is excellent!
I tried running the amount of 2SO recommended in this chart..... which is 21oz/34gal tank. My truck smoked like a freight train with that much oil in the fuel. When I figured out how misleading the chart was, I cut the amount of oil added by 1/3, and made all the difference in the world
That chart is VERY misleading, and recommending people run WAY more than they need to... for proper lubricity purposes anyway