I haven't tracked it since the new install but I imagine it's gone down a little. I get pretty decent MPG though b/c my drive to work is 35 miles and it's 90% freeway/tollroads so not a lot of stop and go.

 

Won't give you much power but what a sweet sound.
That is worth it in itself IMO.
I will never use all the power the car has, but it sounds sweet when you hammer the gas!

 

Well, it's been over two months since I did my first install (what a learning experience that was) and I must say I'm still very pleased with the popcharger/z-tube. It definitely makes the car sound much more aggressive which has been even more noticeable now that the weather has warmed up and I can drive with the windows and sunroof open. Gas mileage has suffered ever so slightly but I don't mind. It's worth it for the smile I get after that 3500-4000k growl. Not that I've saved a little extra, the MD Spacer and OEM front lip are next!