I use strictly top tier gas basically
Never. Use top tier fuel. The MAF will likely need some cleaning moreso than the injectorsAt what point do you start using a fuel /injector cleaner on a new car??? Do you wait for issues or is there a mileage that you would start using it???
^^This.Or never.
I think Hyundai and Kia recommended a fuel additive regardless of top tier usage.For example, in Hyundai's manuals they specify using a fuel additive like Techron if not using top tier gas.
Are you using Top Tier gasoline?At what point do you start using a fuel /injector cleaner on a new car??? Do you wait for issues or is there a mileage that you would start using it???
I started having issues with my 3.5L ecoboost. strange roughness at modest power levels and decreasing mpg on every tank. I used mutiple bottles of Techron, problem solved.After the warranty runs out. Or never.
How do you know that wasn't an environmental issue, or maybe bad gas? I've never used any of these products myself, and if dirty injectors are suspect, I send them out for ultrasonic cleaning. The gasoline should have all the cleaners you need, and as expensive as it is already, I'm not spending the equivalent of another 25 cents per gallon to use them.I started having issues with my 3.5L ecoboost. strange roughness at modest power levels and decreasing mpg on every tank. I used mutiple bottles of Techron, problem solved.
My issue was sulfur reacting with the silver contacts on the sending unit. It was actually a technician's advice that led me to Techron. I was going to take it to a shop for a perceived sender failure, but saved a bunch of money thanks to him.I have always used top tier gas, but even the top tier gas here in California isn't that great.
To answer the OP's question, I start using a fuel additive like Techron just before the very first oil change which is around 5000 miles and then use it before each subsequent change. The cost of a bottle is negligible. And I have never had issues related to the fuel injectors or system.
However as WylieCoyote mentioned, some cars do have occasional issues with the fuel gauge not reading properly. I used to own a Nissan 370Z and that was a known issue. When it happened, I would add 8 ounces of Marvel Mystery Oil to a full tank and that would solve the problem which I believe was a sticky float or sensor in the gas tank. The problem would reoccur after a few thousand miles and another dose of MMO would fix it. A bottle of MMO is cheap and it won't hurt to add a dose to a tank every 5000 miles either although not at the same time as Techron.