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I think that in regards of hill climbing, BSFC could only tell possible problem areas, like very low throttle around 2000rpm which in some vehicles can mean over twice of consumption compared to lower rpm and higher load, but as it is engine specific one really would need map for his vehicle, which in case of my car with XUD9TE engine is next to impossible to find I have found out.
But, one has to remember always that it is per power unit, so sometimes being in bad BSFC area is not so bad as amount of power requested is so low.
When accelerating power request is for very short time, so it can be better to use that 70% at max torque rpm, but just briefly.
When climbing up a hill one has to work out time, how long going to need power, usually optimal is to let speed decrease so that at peak speed is low and hill builds up speed, even for longer hills, but with longer hills one has to consider how long and what amount of power is needed, then which gear and speed will give less consumption and there BSFC table could be meaningful to calculate different total consumptions.
So BSFC in my opinion is not all the answers, it is completely useless for many situations, but it can be useful to avoid some pitfalls with long hills.
Still it is learning process for me, to understand all things that affect to end result so that I would be able to use all that information to make good decisions.
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