[Larry75]

Well before the haters start Yes I messed up!.
2013 Dodge Charger 5.7
58,559 Miles

Noticed my mileage had dropped from 21 MPG on the highway to 17 - 19 MPG. Using 91 Octane gas since the day I purchased her new. I don't know what I was thinking except the plugs would go 60K before replacement. The Manual calls for replacement at 30K.

I pulled the old NGK plugs
and replaced with DENSO Iridium TT. Two tanks of gas later the mileage on the high way is 22.8 !:grin2:


Great Plugs.

 

[RAINMANyeh]

Good to hear youre happy with the new plugs. I changed them in my old Charger each time at 30K intervals and has no issues. I stuck with the stock Champion plugs each time. Keep her between the lines and shiny side up? :driving: