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Diesel_Dave -
You can use the fuel log to calculate how much you have saved. Your "Total saved:" is $829.22, so you could argue that the ScanGauge is "free".
In terms of MPG, the weather has a good correlation for me, but I can't win when it comes to traffic. I used to have control over my schedule so that I could avoid the worst commute time, but now I have to drive into the teeth of bad traffic and life stuff gets in the way. That has cost me about 3 MPG, so I am no longer going for summer 90-day MPG records.
There is also the possibility that I need a tune-up.
CarloSW2
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