Dont forget my sheet assumes you use cracking unit and second distillation tower as well. So if you do a low tech processing of oil you would be able to get 600 mb of methane and 600 mb of LPG per bucket of BC oil which is what you get from oilsand. That has a total fuel value of 0.6*45000+0.6*256000= 180.6k Eu per bucket of oil. That is still a lot less than you get from making nitro diesel as that produces 1250 mb of nitro diesel for every bucket of oil or 640k EU which is 3 times as good. Your example with using it in a railcraft boiler would be much less efficient than just using it in a regular GT gas turbine.
My example was using
PneumaticCraft LPG, it produces a different amount of energy and has a different process to refine it from oil. You've got to first refine oil in a refinery and then run the diesel, kerosene, and gasoline you get through a thermopneumatic processing plant.
A 36HP railcraft turbine produces 14400L/s steam as I already said, by the maths a single bucket of PC LPG will run that for slightly over 18 minutes, in a large steam turbine with a T3 turbine that's enough for 468EU/t, as the bucket of PC LPG runs for about 1086 seconds at that rate it would produce about 10.1M EU per bucket of oil. As already mentioned you get about 734mB of LPG per bucket of oil at max using PC refining, which when multiplied through gives 7.46M EU before processing costs which are trickier to work out. As it's so efficient with something resembling even a half decent setup you should easily be able to run a dozen or more 36HP boilers in parallel, quite possibly several dozen. Considering PC LPG seems to be able to power it's own compressors with similarly amazing efficiency I suspect that the processing costs wouldn't be all that high, I've been trying a test setup and the lower tier of air compressors seem to be much more effective due to the inability to overheat, I've got three with seven speed upgrades each keeping 7 vortex tubes and three thermopneumatic processing plants at 4.8-5.0 bars without trouble, and the fuel still looks like it'd last forever per bucket. Keeps my refinery and plants all at 400+ degrees.