The only on-road diesel sold for the last few years is ultra low sulfur. Diesel #2 is sold until winter gets too cold for it and then what you get is a blend of #2 and #1 or, if it's too cold it's #1 only (#1 diesel gives less power and lower mileage as do the aforementioned blends).
To bring more confusion there is biodiesel which in lower percentage blends (5 or 10% during summer) runs about the same as #2 but a little cheaper. On a trip through Oregon I found that 5% to 20% biodiesel is required there but I couldn't discern and power reduction and the mileage was as good as I've ever gotten. I have no idea how they will deal with the winter blend.
A benefit of biodiesel is that it lubricates and cleans the fuel system.