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The BSFC curve is only valid when the engine is making the torque in the other curve, IE when heavily loaded during acceleration. I really do prefer graphs of BSFC plotted against torque as apposed to with or BSFC plots at different levels of load.
Looking at that torque curve you get up to speed fastest (least time spent accelerating) around 3800-4200 rpm with a nice little secondary dip in BSFC. I tend to prefer a quickish acceleration (If there is not much of a fuel economy hit).
As for steady state cruising (lightly loaded) some sort of instant fuel economy info will give you better data than a graph depicting a fairly heavily loaded engine.
One thing that may help is a cam reground for low end torque but the cost would likely eat fuel savings.
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