Chipping my Engine?

[Gorealmighty]

I was searching for some aftermarket parts for my Hatch, primarily aesthetic mods, when I cam across a website claiming its chip could increase my HP and MPG. I am familiar with this in big trucks primarily, but I didn't know that it would be available for my Versa.
I purchased the SL for the CVT and its increased estimated MPG, would spending $100 actually benefit me? Is it possible to actually squeeze another 4-7 gallons out of my beloved gas sipper? Any feed back, other than "DONT DO IT YOULL VOID YOUR WARRANTY!" (im aware, but thank you ) would be greatly appreciated.

[Athikerguy4life]

Most chips out there aren't legit, and they may add a little bit of performance, but at the cost of fuel economy or engine life.

Read this before you buy:

http://www.dansdata.com/hotchips.htm