Brian says: "I simply can't envision a the scenario where an elevated combustion temperature can dispose of all that excess heat into the cooling system in a very short period of time and result in a lower exhaust temperature."

That certainly seems to be the question as to how much of that heat can go into coolant or be radiated by the block in the time frames we're looking at. Looking at heat as work and too advanced injection using more of that heat to resist the piston on the compression stroke, it might be true. I'd sure like to know the answer to that.