suggestion: running averages of data?
Just connecting the dots of MPG data is a bit misleading.
It would be nice if there was some running average curve instead of a connect the dot curve. Post a smooth curve, like posting a point at each fill up containing the average of the last 3 or 5 fill ups. That will smooth out variations on each fill due to difference in tank fill level, or mileage readings. Look at Loess curves for example.
It would also be nice if the X axis of the plot was the date, not the fill up number. Then you'd see gas usage over time.
While I'm at it. A plot of mileage/$ or gas price over time would be a neat add also.
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