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Sounds like you are only using the ScanGauge's "instant" MPG reading on the GAUGE screen. While useful in certain situations, you also have access to resettable TRIP, TODAY and TANK mpg.
I highly recommend (a) the grille block; and (b) an electric block/coolant heater.
It's worth noting as well that you will get your lowest fuel economy in winter months for a variety of reasons.
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