Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Thumbs up for Barryman's B12

Im on it tomorrow as soon as I get the car back from the mechanic. I told him to forget about the cats for now, and fix my driver's door lock. Just pouring the whole can of the B12 into the gas tank... is there any risks or performance/gas mileage decrease?

Full tank, half tank, quarter tank? I still have like 3 cans of B12 sitting around from my uim/lim cleaning so I can do this right away but im just wondering on what will happen before i do it.