You're vehicle is being considered an outlier simply because of the lack of other users/vehicles that match yours mechanically. Even if just comparing the 2 vehicles that are "Hatchbacks", your 11 fuelups at 29MPG vs the other user's 240 fuelups at 20MPG make you an outlier.
The system isn't ruling your data as wrong, or invalid. It's simply just much higher than the averages of the other users with same year/make/model.
If, for example you had 100 more fuel ups, you'd move from being an outlier, statistically.
Maybe if our system allowed a filter for transmission type, that'd help in this situation. Something we'll need to look at in a future update.
Originally Posted by sea_king18
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.
It sounds like you have an understanding of what's going on!
If you just add (or rather, when you have) more fuel ups, the graphs will create that double peak... like seen here: http://www.fuelly.com/car/volkswagen/jetta/2015
It's also worth noting that the data generates fresh every hour, therefore no fuelup is an outlier until that hourly query says it is.
Originally Posted by Jay2TheRescue
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?
That won't affect what sea_king18 is asking about. Those are in place to refresh the profile page. Rarely needed/used though, as everything gets updated with Save/Edit.
"The interquartile range is often used to find outliers in data. Outliers are observations that fall below Q1 - 1.5(IQR) or above Q3 + 1.5(IQR). In a boxplot, the highest and lowest occurring value within this limit are drawn as bar of the whiskers, and the outliers as individual points."
There are lots of obvious errors that then get washed into a poor overall average.
Look at this for example 2011 Town & Country Ltd. (Chrysler Town & Country) | Fuelly
what should be a great set of data with supposedly 70,000 miles logged. The average seems great but start to look at the individual entries and you see a more normal 20 MPG. Go way back and suddenly 250 mpg tanks start showing up. Look at the best tank, 320 mpg. unless you are some kind of special prototype, or a scooter, any tank over 100 mpg should be thrown out.
I would bet any tank that is over 3 times the average of the model is some kind of error that should be flagged and not included in any overall averages.