Fi, I generally google firewood BTUs. Find a couple tables on wood I'm unfamiliar with, then compare the different rating. You could google robinia psuedoacacia btus, as well.
an example
http://www.consumerenergycenter.org/home/heating_cooling/firewood.html
It doesn't tell you about coaling...
Reason I mention sapwood, I thought Stig recently mentioned in his experience, Black locust sapwood rots relatively fast compared to heartwood. Might be misremembering.
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