Bob, my car is new, and I have not yet seen over 10 pounds of boost (waste gate set at 10 pounds,) but the two other cars I am familar with that run 28 pounds (and one, up to 37 pounds,) do it all on gasoline.
It might be easier on alcohol; I don't know.
Since my car is so new (I've on;y had it to the strip once, so far,) I wanted to get the chassis sorted out before trying to run more boost, but I surely will, shortly.
