They are supposed to be colder. the stock plugs run too hot. I get 1.5
mpg better mileage with them in my R/T. I used the gap listed on the label
on the hood.
pcoyle wrote:
> Hey gonna do some mods to try and better my 10 MPG!
> Installed K&N drop in filter,5w-30 Pennzoil Synthetic,45 psi in my
> tires.
> Now got the 3923's , but I found out they are 3 or 4 heat ranges cooler
> than origional plugs.
> Should I put them in anyway? .040 Gap?
> Thanks
> Great site!
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