Is this just a gimmick fuel additive? in other words, I have no doubt about it improving my mileage for the one tank full of gas it is added too, but there was no improvement on the next tank burned without it. so, since it costs $9 bucks, I need to save more than 2+ gallons per tank (in additional mileage equivalence) and I'm not getting that. might as well run STP for $1.99 (kind of serious with that last comment)? so is there no internal motor action going on? Thoughts?

Thanks

 

Many of us doubt its efficacy regardless of how it is used. Personally I maintain it is nothing more that huile de serpent, even for the first tank.

 

Thanks, I had to look the french phrase up. You've enlightened me today.

 

Any time my friend.