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One other possibility is that the ScanGauge can only calculate the instant MPG from the data from the ECU and maybe that is not providing the information to the SG to come up with anything more accurate that what we see. As far as the injector pulses being measured by the SG that may not be the case. Imagine if the injector pulses were tracked and counted but only the gas burned was saved in 0.1 gallon increments. Then in a tank with 50 stops and startups might loose the fractional parts of the tenths of a gallon and that can add up to quite a bit of gas.
As far as the readings you are getting that don't seem smooth - it is caused by the resolution of the numbers it calculates with. I also have seen the numbers not change as I moved the throttle and I don't know if the ECU is not measuring the movement of the throttle butterfly or the SG is not seeing a big enough change to increase or decrease to the next 0.1GPH digit.
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smartzuuk 
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