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I don't think we were disagreeing on the underlying facts, just on the terminology.
I contend that the BSFC map itself does not change--that it depends solely on the engine and ancillary systems. However, reducing your drag means that you need to make less power to cruise at a given speed, so you change the "load" coordinate on the BSFC graph for that cruising speed.
In most cases, you will put the engine into a regime where it has worse BSFC--but the overall fuel consumption will also decrease, because the BSFC talks about fuel used per horsepower generated, and you need to generate less horsepower overall.
-soD
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