Hi all.
I have done some long tests. The pulstar spark plug seems to do some good afterall. At first I tried to load the generator with a 600w load, this mada a difference in economy of 2% in favor to pulstar spark plug. Then I increased the load to 800w and the difference reached 2.8%. Then I loaded the generator with all I had - 1900W. This made a fuel economy of 3.85%.
Then I made a test with an iridium spark plug, this one has an /\ shaped electrode made of iridium. This material deals with heat and burning up better, also the /\ shape makes it difficult for some impurities to stick between the spark gap. This made only 1.3% more economy compared to the standard spark plug. I also tried the standard spark plug and a ceramic magnet array around the fuel line. The magnets gave 1.5% fuel economy. So I figured that magnets + pulstar plugs should give 3.85+1.5=5.35% economy. But this setup gave only a slight improvement compared to pulstar plugs alone - 4.25% economy.
I did some math, if I use these spark plugs on my car, I have to drive at least 15000 kilometers till these spark plugs pays themselves off. Who knows what their condition will be after that. That makes me believe, that this is not a smart investment at all.
I will make some more tests and keep you updated.
Here are some pictures of the iridium spark plug and my generator load:





Thanks,
Jetijs