Can we use these?

[GhostMercury]

My friends use these gas tank pills and they say they work. Is it safe to use on our cars? http://myffi.biz/p-207-1-mpg-cap-blister-pack.aspx

 

[Super Unique]

Google can be your friend

http://www.ripoffreport.com/reports/0/179/ripoff0179058.htm

 

[GhostMercury]

thats not for the product im talking about. and my friends have them and use them. I'm just not sure if they are safe to use in our cars.