I deliver fuel...most does come from same place in your area, additives are what make the difference BP, Jet, Texaco, Tesco,Sainsbury Shell, however although most comes in by ship is pumped to storage additive is added at point of loading, we bottom load on the racks and the additive is injected into the line depending on which retailer is being loaded..however Shell VPower nitro as its now called is made in a designated refining operation and is a sepetate product with excellent properties for anti knock corrosion inhibitors and carbon cleaning properties its rated at 99Ron....its what i use in bike and car worth the extra wonga....