Originally Posted by JKJeepJunkie

If your worried about gas consumption caused by the spark plugs its because they are worn out and aren't sparking like they should ive recently changed mine and ive noticed better mpg and its alot smoother idle and take off im running champion iridium the factory OE is a double platinum but you can't gap a fine wire platinum plug just stay away from Bosch plugs and E3 plugs and NGK's and you should be fine

Originally Posted by 5150cliff

Why can't you gap a fine wire plug? I bought the Champion Double Platinums and they gapped perfectly. Did I miss something?

Originally Posted by MrHooah04

Thanks for all the great advice..just trying to pinpoint the problem. I only have 33's and the TF 2.5" Coil lift and I'm at 13 mpg..I've got an 07 jku auto, just seems way off for my 4.10's. it also idles rough so that's why I'm wondering if my plugs are bad or not.

Thanks all, keep the advice coming!

Originally Posted by JKJeepJunkie

Because the fine wire plugs the di-od is so brittle that when you gap them you chip tiny pieces off you won't be able to see them but it happens and it changes how it sparks somehow i had to take a class on all this working for orielly auto parts