Ah the no ethanol brigade. What reasons do you have other than hearsay not to use it? I use PC 94 (have also used husky 94 in my 450 whp supra) and have zero issues other than increased power over 91. The use of ethanol MIGHT reduce the energy content of the gasoline by 1-2%, which is offset by the additional timing that can be run. On the highway, I notice no difference in fuel economy.
As far as vpower is concerned, this thread is proof that shell does a bang up job at marketing.