Hi Jim,
In my previous post on ketosis I mentioned that the heat preferentially 
uses ketone bodies. I should have said that it preferentially uses fatty 
acids. Thus, the sentence should have read:
"I have often wondered just how much of that is caused by the diminished 
availability of fatty acids to fuel the heart." Ketone bodies are, of 
course, by-products of the breakdown of fatty acids for energy in the 
liver and kidney, so a state of ketosis ensures ample fuel for the heart.

see: Shohet RV & Garcia JA, Keeping the engine primed: HIF factors as 
key regulators. of cardiac metabolism and angiogenesis during ischemia. 
J Mol Med (2007) 85:1309–1315