I think Chevron FI cleaner is the best you can get without going out of your way to clean your injectors (like spending 20 on a can of cleaner or pop the hood). I use it every 1.5 or 2k miles and i just put some in and used the tank and my car starts a little quicker. I have been using FI cleaner for the last 25k miles religiously. I think the stuff works.

BTW, the zmax stuff was tested and i had read that it is mainly alcohol! 39.95 could buy at least 9 bottle of chevron cleaner.

 

Anyone ever use Lucas? I heard that was some of the best stuff. I use it....