Originally Posted by jr0bb5
I'm also going to stop using the TC-W3 after my quart is gone. If I notice a big drop in MPGs after stopping, I may start using it again. It's too difficult to tell if it was making a difference or not with the colder weather and winter blend fuel.
I'm going to keep using it because the extra lubrication is beneficial, just not worried about mpg differences right now, when everything stabilizes again in 6 months I will.
I know for a fact my Buick idles smoother and injectors are night and day quieter.