I’m not a chemist. Presumably over the first couple of thousand miles the entire fuel system gets impregnated with the magic minerals. Perhaps the cylinder head is affected - I don’t know.

The measurements on the TD5 showed two things:-

(1) You cannot measure fuel performance yourself. I had to drive the same 52 mile circuit five times to get an average reading. I was trying really hard to drive at the same speeds and in the same gears around the circuit, and was being timed with a stop watch over each section. Despite this there was up to a 10% difference in fuel consumption on different runs.

(2) After the PowerPlus unit had been switched on, the average for the five runs after, compared to the average for the five runs before, showed a significant drop in fuel usage.

Laurie Wright, the LRO observer, commented that I was driving more aggressively on day two (PowerPlus switched on). I was a bit miffed at this remark because I didn’t think I was. I realized afterwards that what Laurie had detected was the improvement in the power being delivered. I wasn’t giving it more welly, the engine was delivering more welly.

Anyway, you’ll have to believe me about the power increase. But I suggest you ask PowerPlus to send you a copy of the report and read the facts about the fuel usage.