Way overkill. For 3 cars and many years I throw a bottle of Techron in once a year.
I once let it go for about 2.5 years to see if even that was a waste of money, and the idle got a little rough.
A bottle of Techron smoothed it out within 10 miles. BTW I use the cheapest gas I can find.
I’ve also used Techron to fix a chainsaw that was running poorly.
I also clean the throttle body at ~100,000 miles.