Still, it doesn't hurt to use a cleaner. I use it before each oil change, 3-5000 miles.
And I tend to pull into any major brand station with a low price, sometimes not top tier.
I buy the 32oz bottle of Techron, which is cheaper per ounce than the 12oz on sale.
It's not as convenient as dumping a little bottle in the tank, but I also use it in my chainsaw gas, so I'm measuring it out anyway.
It's a waste of time and money, both of which are limited for most people. That's how it hurts.
Now, I do not drive nearly as much as a professional driver, not even close and I understand that. But I have driven over 400,000 miles and never bought a single bottle of fuel treatment other than drygas long long ago like @mtbsteve
mentioned but that had a very specific use and under certain conditions. I don't think I've even looked at dry gas in over 20 years.
I've only changed 1 set of injectors and that was on a 1992 TBI setup with 200,000 miles on it because it failed emissions and I wasn't in the mood to play games. I changed them for $60 and it passed emissions, no fuel treatments, no special sauce. I guess I could've dumped 134 bottles
(34 gallon tank) of fuel treatment at $5.50 each in it over it's lifetime and maybe it wouldn't have needed two $30 injectors, but I highly doubt it would've mattered considering those injectors were mechanically worn, not clogged.
134 bottles, that's what, $750? To do, in my opinion, absolutely nothing. I'm sorry but in my opinion that hurts.
I won't even do it if I'm not using "Top tier fuel".
I certainly do not mean to be disrespectful, please don't take it that way.
Fuel additives, oil additives are just something it seems most do just because they always have and have never had a problem. But I'd bet they would've never had a problem without them.