Well, the cost of the additive worked out at about £3 per litre, I worked for the company that supplied an early version to Shell, it actually cost us £2.20 a litre to produce it. However, the treatment level is fairly low so the profit that Shell is making is not that excessive, you're probably looking at somewhere around 2.0p worth per litre but bear in mind that Shell have to blend it and that'll take a fair bit of time and energy plus of course the R&D that went on before it came onto the market .
Pete
I'm not denying that but 99ron is 3-4p more where as vpower is 9-11p more expensive a litre. The tax is the real killer though