Fuel injector fluid?

None.

Useless u mean fuel injector clearer. The stuff u put into ur gas tank. If that is the stuff you speak of then you don't need any. Modern fuel injectors run at a good amount of pressure that using a cleaner would not serve you much gain.

But I do grab a bottle of lucas every time its on sale for free after rebate. That's about once a year. I see no difference but it doesn't hurt my wallet either. Fuel injector cleaner should be more on older cars.

TapaTalking
 
I've used Lucas before when its on sale too. Only when the sales associate offers it while checking out is when I buy it, lol. Other than that, I use a full can of Sea Foam in my gas tank every once in a while. I also believe using higher tier gasoline helps because they use more cleaning detergents that will help keep everything clean in the long run.
 
I always add a bottlre of fuel system injector cleaner to a full tank of fuel at each oil change interval. And I have seen the fuel economy decrease when I don't do this. It's less critical to do when you run premium higher octane fuel.I only run premium fuel and still do tthis as part of regular maintenance. If your running a lower octane fuel then I would make sure to do this at oil change intervals.
 
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