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Just went and did a bit of reading on all this BSFC stuff, as far as I can ascertain, it is the point the engine reaches it's highest efficiency, which generally is around the peak of it's torque curve with open throttle. Generally peak torque is significantly below peak power, so when driving at peak torque rpm will feel like the engine is labouring a bit, but just slightly over that rpm, it will generally have a nice kick if it isn't overloaded.
My engine reaches peak torque at around 2,000rpm & max power at 3,600rpm, from my experience the engines sweet spot is around 2,500, which equates to 100km/hr in top gear.
So from the bits I read, the indication is to try hold the engine rpm at around maximum torque on a mostly open throttle, not easy as load keeps changing.
Now if you had the engine mated to a suitable alternator/motor through a cvt
the engine could be set to run at ideal BSFC, low load it charges batteries, high load the electric motor does the boosting, but that's what Hybrids are all about, aren't they?
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