octanes,the power limit of an engine is air not gasoline

[raaaid]

i heard a lot on how spit i and 109 are porked for using low octanes, well:

what limits the power of an engine is how much air you can put on the cylinder, thats why turbocompressors are cool

if theres one mol of 02 you can get a limited amount of mols of H2 and C burning

if theres no enough air in the cilinder it doesnt matter you rise the octanes or put more fuel it wont burn

in other words it has identical effect on terms of power inject more gasoline to inject less with higher octanes

edit:

methanol injection i guess its different, its a different reaction which with the same amount of O2 you get more heat

but more or less octanes dtermines the proportion of H2 in the fuel

you can put in the cilinder lot of h in litle fuel or litle h in much fuel, its the same

what has me clueless is water injenction, anymbody knows the advantage

whay cars not use water injenction to save fuel?