I used Pulstars, as a road test in my courier work, until one failed and damn near destroyed a coil pack.
I didn't think much was happening at first, because I had some trouble getting the computer re-set, why would I want to follow instructions and disconnect the battery, and because my main concern was fuel economy I ignored the better running and power increase that became apparent when I switched back to the stock plugs.
My experience so far:
Noticeably better running.
No difference in MPG.
I suspect the reason is the computer is set to adjust the mixture so the exhaust gas reads 'X' and when the Pulstars made it cleaner with better combustion, the computer simply enriched the mixture.
I use and talk about, but don't sell Amsoil.
Who is shatto?
06 4.7 Tundra replaced a 98 Dakota 3.9.
623,000 miles on original engine and transmission, using Amsoil by-pass filters and lubrication.
+Everybody knows something you don't know.
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Retired Pro-Hunter featured in; 'African Hunter', by James R. Mellon III. and listed in; Rowland Ward's Records of Big Game.
perhaps there is no magic bullet for current engine technology. I look with suspicion at anyone claiming changing one part will provide 20+mpg improvement with no driving style changes. If you want a huge improvement over your base milage change your driving style. Even with an HAI driving style is more important than component changes.