Yes its suppose to clean out the injectors and increase mpg but then so has V Power.
What you said in the first post was not clear to why you wanted to use it. you mentioned a 300 mile trip hence why i guessed it was to do with mpg.
Realistically, how much do injectors need clearing after the fuel has gone through your fuel filters. It'll be minimal, to no difference. I'd be surprised if you saw any effects. If you were to take out your injectors and have them all flow matched and balanced and reinstalled and then use something like that in every tank from the get go, it'd be a different story.