I seem to notice the opposite effect - I'll be getting a particular MPG for a tank, and then fill up, all excited to improve upon it (warm engine, etc.), especially on a trip. But the ScanGauge will show much LOWER mileage for the first few miles. Seems like I can get it to start climbing eventually, but not at first.
I do try to top off the tank until it won't hold any more, thinking that's the only way I can be sure it's the same each time. Is this somehow wasting gas (burning extra out of the carben cannister & running rich, or something).?
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