I have never saw a station that carries the Premium Diesel, but I have heard of it somewhere else recently too. I did a quick Google search and this was the first thing to pop up when I asked "What is Premium Diesel Fuel?"
"A
premium diesel has a higher cetane number, better lubricity and includes detergents that provide injector-cleaning capability versus standard #2
diesel. Cetane measures a
fuel's ignition delay. ... Detergents keep
fuel injectors clean for optimal engine performance."
As far as having higher cetane in it, you can get that from using Power Services (summer or winter formulas) or Howe's Diesel Treatment (all season formula). Both add cetane and also keep your fuel from gelling in the winter (have to get the Arctic Formula from Power Services whereas Howe's is an all year forumla). I have used both, but currently running Howe's. 1 oz per 5 gallons of fuel, and it comes in a 64 oz. bottle. I usually aim for 5 oz. per 20 gallons of fuel though as adding more is not bad for the engine. It costs me about $14.00 a bottle. So, if I'm figuring it right, and I'm not sure I am so correct me if you think I'm wrong haha, but $14/ 64 oz is about $0.22 an oz. So, if I fuel up and get 20 gallons at current price of $2.35/ gal, that is $47. I would use 5 oz of Howes at $0.22/ oz so that would be $1.10/ per fillup.
Would I then add dollars together and divide by how many gallons of fuel I put in the truck to get how much it is costing me per gallon to add Howe's to the truck? Again, not sure it's correct, but if that is true, $1.10 plus $47 = $48.10. Divide that by 20 gallons and it comes up to $2.40/ gallon. So it's costing me $0.05 per gallon to add Howe's....I think.
If my math is right, you may consider this when thinking of purchasing Premium Diesel, especially if it's a good amount more than regular diesel.