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Sorry to bump an old thread, but there is a converse to this. I have the only manual transmission listed in my model year. The other cars are getting about 22 mpg, I get about 28-29. Every one of my fill-ups has been thrown out as an outlier.
1989 Saab 900. |
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It hasn't been thrown out, that's a poor choice of words. On the chart that shows the distribution of mileage by fill-up, mine are all counted as outliers. I see the number of outliers incremented each time I add data.
The issue is that as the only standard in the group, I'm about 40% high and the algorithm flags the data. |
1989? Gee... The computer knows that's when dinosaurs ruled the world.
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You only have 5 fillups so far. I think after you've been using Fuelly for a while, they will probably start showing up on the chart, and not be cast as an outlier.
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I assume that the application is using standard deviation to determine the outliers, but the problem for the '89 900 is that about 3/4 of the fillups come from a single vehicle and it's running 19.3 MPG (US). This vehicle should show a double peak (one for the standards at about 28 MPG, another for the autos at about 21), not a standard bell curve. |
11 fillups now - all have been pitched from the dataset as outliers.
It looks to me as though any given fill is checked against the rest of the data at the moment of entry and, if flagged as an outlier, never checked again. This saves processing time but ignores any emerging patterns in the data. The '89 Saab 900 has almost 10% of the data marked as outliers. Is there a process to periodically reanalyze the data? If not, there should be. |
There are links on the admin side to make Fuelly redo the math on your vehicle, but when I click on them, I get a no permission message. Maybe someone with higher admin permissions than me can try?
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