Just had to log on a post a note-
Changed plugs a few weeks ago.
Had 75k on stock FMC plug on my 3.2l and changed to the Denso IKH20 Iridium Power Spark plugs and the difference is absolutely noticable. Maybe the old ones were getting a little dirty,they still looked good, but my car has never run better. Amazing difference on acceleration. Haven't checked the fuel rate yet. One thing of note, the standard Ford plug had 3 prongs and the Denso only has 1....but who cares! Awesome plugs. Paid about $7.25 a plug after 20% discount.