I played with it when it first came out.It did pick the car up about .05,but the extra cost over VP's other fuels (110 or even c12) make it not real cost effective for me.
They tell you you will need to jet up a few sizes,witch is true,but they neglect to tell you that you also need to richen up the idle circuit and give it more pump shot.
It took a couple weekends to get it where I wanted it,but in the end I went back to C12.