I could probably dig back though my stuff and find the relevant numbers to crunch the math, but it's not really my field so it would take me a while. I can't find any real hard math or numbers that anyone else has done posted on the web, and believe me I've searched long and hard in the past and I've found some wacky stuff but nothing 'scientific'.

We all know, or hopefully are aware, that fuel savings, torque increase and emission reduction depend on the engine in question. Looking at it from an engineering viewpoint it would appear that the effect of hydrogen in the fuel/air mix depends on the valve/injector geometry. As such, if a calculation were to be done one could only determine a MAXIMUM. In reality statistical analysis would still be necessary.