it might be .35 maybe .40 for 4.7 i cant remember, kent maybe you should try the laser, maybe thats the difference between 25 mpg to yours.....just my 2 cents.... you get my pm?

no misssing idles like a cadillac....

 

I thought I would try the cool "new" E3 diamond fies and literally melted them. Same boost same abuse and my NGK's didn't even get phased. But in the end of the day choose the ones you like.

 

i run ngk in everything, literally EVERYTHING from a lawn mower to my dirtbike.....best performance you can get is those laser ones, im telling you!!!

 

Autolite 3922, I'll start there, cheap and suggested by autolite. If they start causing problems I'll switch back to plantium.

 

try doing the math with miles and check your gas mileage....let everyone know the results!@!! please

 

Currently getting 16 to 17 mpg. Will be easy to figure. Ill report after 2 or 3 tanks. Pulled Champion out when I swapped. All the plugs removed were properly gapped. They still looked good.

 

evidence of good plugs, i would of gone to iridium, i had the champions for a long time and they even worked good, my ngks are just so freakin sweet.

 

25 mpgs, with a V8, eh?

 

25.7 to be exact if its perfect conditions going down the fwy yea i can clock it ill take a picture next time.

obviously when my throttlebody is clean, air filter, new oil yada yada yada

 

my quad cab with a 6 speed got 19mpg once all hwy lol. I wish i could get 25! my mazdaspeed 6 got 24mpg regularly and that was poor from the turbo and lead foot. i wish i could get near that now!

lghtngblt02, i see you are in lemoyne! i commute to harrisburg everyday for work, and i see the capitol building in your signature pic. we should meet sometime.