Ok, I've been digging thru the net trying to find a BSFC for my car. I think I found one, and a wealth of knowledge from this MIT paper:
http://dspace.mit.edu/bitstream/hand...pdf?sequence=1
It's 115 pages, so don't start it unless you got some time
It's quite in depth and covers many effciency topics including EGR dilution, NoX reduction, Lean Burn and Hydrogen boosted Lean burn. Quite in depth.
The first chart is the baseline without any EGR function, the second is with 10% EGR dilution and the third is with the Hydrogen boosted Lean Burn.
Enjoy!!!