Randy,
Do a forum search for 150 octane. Then go back to the performance web site and look up the most recently released data sheets comparing the K4 versus Spit14 on 150oct. Look at the data sheets for P51B\D on 150oct and the K4 data from the XIV comparison. I suspect the game from a playability standpoint would be destabilized.
At 21lb boost and 70-75Hg, even with 150oct being what the XIV and P51D used over the continent from 44 on. Our luft fans would probably leave the game. And forget trying to play in the MA any other way than would be dictated by the P51D weenies, who many of them fly it so they don't have to fight.
D9 1.8 ata
K4 1.8 ata
XIV 21lb
P51D 75Hg
Fighter--SL-- Alt 410mph
D9-----377-- 11,000
K4-----366-- 12,500
XIV----377-- 8,500
P51D--398-- 2,500
It's obvious why 150oct as a war evolutionary point of view to destroy the enemy. From a game stabilization point of view, we are limited to the octane used at the factory on the first production delivery date of each given model. Or if Hitech perks it. Do you want the P51D perked? We would probably loose players over that.