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I'll second the "are you sure you're filling it up the same way each time" point.
I fill to the brim at the same pump, same direction each time, so I know my calcs are as close as possible.
And also, yes, you can get accurate fuel economy instrumentation for less $ than a ScanGauge: there's the somewhat DIY route of the MPGuino; also, look up the PLX Kiwi- they have a less expensive than ScanGauge model.
Highly recommend you get some fuel economy instrumentation. It makes the game a LOT more fun, and it'll pay for itself many times over, seriously.
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