Use the actual engine size.
Using engine size, rpm, and MAP, the SG can calculate how much oxygen is being pumped through the engine. (piston pumps per minute * cylinder displacement * air density)
Then, assuming it's fuel injected and uses closed-loop O2 sensor feedback, the fuel must be ~1/14.7 of the air volume for a clean burn.
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Really, though, calibration doesn't have to be ideal. If you improve your driving technique by 10%, you'll see a 10% improvement at the pump.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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