[quote author=Waldo link=topic=79421.msg1499413#msg1499413 date=1182269798]
If they could truely give you 1-2mpg, don't you think the OEMs would use them? You can't imagine how many millions they will spend for a few tenths of a MPG.
[/quote]
Some cars do have Iridiums as OEM, its just stupid to have all cars use them as OEM. In the US alone, 18million new cars are sold a year on average. That might be around 90 million iridium plugs if the average cylinder was around 5.0 for all cars sold. 90 million plugs would cause a shortage of iridium in the US alone, and not counting the rest of the world. That would drive the price up insanely for each plug making it no longer worth the 1-2mpg increase for the average user.
I agree with the logic of "If it were best, OEMs would use it" for the most part, but not always because economics becomes a major x-factor.