I've tried it over several fuel fill ups, noticed a slight improvement in throttle response no measurable improvement in mpg. Stopped using it for those reasons. My vehicle is an 01' Cherokee, your results may vary.
I believe it was discussed here. I thnk the conclusion was that it worked as advertised but was too expensive to use on a regular basis. Try some FP60 or FP3000 from www.lubecontrol.com.