It is a blend of #1 & #2 fuel. The blend is different depending on where you are located in the country. The primary benefit is you don't have to run straight #1 in most areas and you will not gel up (frozen fuel). If you are in cold country you are using winter blend.

That said it looks like you live in Texas so you shouldn't have to worry about this unless traveling to high altitudes or further north

Like most fuels, diesel is a mix of hydrocarbons, and the components have different freezing points. For Number 2 diesel, as the ambient temperatures drop toward 0°C (32 F), it begins to cloud, due to the paraffin in the fuel solidifying. As the temperatures drop below 0°C, the molecules combine into solids, large enough to be stopped by the filter. This is known as the gel point, and generally occurs about -9.5 degrees C (15 degrees F ) below the cloud point.