Brake Specific Fuel Consumption - Literally, the number of grams of fuel required to produce 1 Horsepower Hour of work from your engine.
Your peak BSFC occurs when you're producing the most torque for the least fuel. It's not always the most economical place to drive, but it's the most efficient. (If your BSFC island falls in an area that is making more torque than you need to operate at speed, it's not most efficient to downshift so that you're in that range. Instead, upshift and use lower RPMS, which will indefinitely use less fuel.)
BSFC (IIRC) is based on WOT, and sea level, though.
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