I was getting 23mpg with a lot of highway miles until I put the 178 pulley on her. I think it is closer to 20mpg now. This seems to be the range for a SRT. Having the pulley does make you want to punch it more ofter though, so that could explain the sizable drop in mileage with just a simple pulley upgrade.

If you want 30mpg, unplug the SC! Of course there is NO fun in that, but you can do it.

Cheers,
KrzyFast