Once again---Do a Google Search and read the returns. THERE IS NO STANDARD FOR WHAT "PREMIUM DIESEL" IS. Without holding these guy's feet to the fire and making them comply with certain minimum standard, you'll get whatever the guy running the station wants to give you. Could it have a higher Cetane? Well, maybe, if he feels like it. Does it have more additives? Again, maybe, if he feels like giving it to you. Of course he could have added a quart of special "booster" off his shelf into his 10,000 gallon diesel tank. Yep, you got more. Is it measurable or worth anything? Only if it meets some standard, AND THERE'S NO STANDARD. Buy what you like, but as the old saying goes--- Let the buyer BEWARE.