I quit using techron because they market several varieties of fuel injector cleaners and I can't tell which is "the real" one. I just use Red Line or Gummout Regain. I do like Chevron fuel though.
Techron or ProGard. Techron is the one you want.
They all say "Techron" on the label.
The top shelf product right now is "Techron Concentrate Plus". That's the replacement for the older Techron Concentrate. As far as I can tell, the only difference is that it's more concentrated in a smaller amount of solvent.
I am formulating a cleaner base on Chevron Technology. I have the drums of the super concentrate made by Oronite, and various formulas for this concentration provided by them.
-- One for adding to gas station tanks for continued use.
-- One for low cleanup
-- One for medium cleanup (what they told me to prepare for a "high quality" to match normal fuel system cleaners)
-- One for high cleanup
-- One MAXIMUM
I don't know what the Techron formulation actually is. After some serious testing, I'm rolling out the "high cleanup" formula to blow away the competition next week. Mercedes (after testing) has already told me they want to provide several bottles in every new car sold along with the recommendation to use regularly.
(PEA of the concentrated drum is 70 to 80%)
Red Line SL-1 is available at Pep Boys and on Amazon.com.
Which one you choose may not be quite as important as consistent use and the correct dose including keeping up to date on your fuel filter and trying to keep your gas tank as full as practical especially in cold and/or humid climate. Also you might consider never topping off when you fill the tank. Those last couple of clicks can lead to problems with some cars. You can probably squeak by without that extra quarter mile of range if you're very careful.