Firewood performance can differ from one tree species to the next. The type of tree you use for burning can vary widely in heat content, burning characteristics, and overall quality. I have created a table that provides several important burning characteristics for most species used in North America.
A common tree's heating potential can be determined by looking at its wood density and the amount of energy it can produce, usually measured in British Thermal Units or BTUs. I list these facts as well as the wood's ability to retain coals overnight.
Burning Stovewood - University of Tennessee/EPA/Woodheat.org