Im been using NGK copper, and currently running autolite copper, im travel alot, so I change out copper very offten, I also her put platium plug to improve gas miles ( I dont know how much, but I read some where here it only save 1miles ), and also put synthetic on your tranny and rear will inprove gas miles too.
Im currently doing complete tune up before winter.
oil change to 5w/30 mobil 1
tranny and rear oil mobil
Spark plug platium and motocraft wire
coolant flush and refil
take out 180 stat and pop in 195 stat
replace 2 rear tire haha you guy already know why hahaha
check brake and bleed the brake
is power steerling fluid ever need to be change ? it still really red.
10k miles on a copper plug? You can go a lot further than that. At around 80k miles, I removed the origional plugs and installed a new set of motorcraft plugs from the dealer (platinum I believe). The car now has 155k miles and still gets 25+mpg on the highway and 20 in the city. If it starts to miss or have difficulty starting in the cold, I'll throw some new plugs in.