Assuming the process cost £50 that would pay for the additional cost of Vpower over standard fuel for at least 350 litres (80 ish gallons) or about 5-6 tankfulls, probably more. The only way you can say with certainty the process works is by running a comparable car through the same cycle but without the probe. However you would also have to make sure both engines were in the same internal state. I am sorry to pour cold water on this process but if it is such a fantastic process i do not understand why it is not used more widely and by main dealers workshops.
The cost benefits of premium fuel on a fleet are different and my guess is the vans are replaced at 3-4 years old so very high milage problems dealt with by the next owner? I can only go by my own experience of driving an average of 20k miles for 45 years of which the past 35 have been in diesels.
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