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-   -   Difference in displayed vs measured MPG: Statistical Analysis (https://ecomodder.com/forum/showthread.php/difference-displayed-vs-measured-mpg-statistical-analysis-38673.html)

Vman455 10-12-2020 10:54 AM

Difference in displayed vs measured MPG: Statistical Analysis
 
In the garage, I have recorded the MPG displayed on the factory gauge for almost every fillup. Leaving out the two I missed, there are 178 fills with these data. Since I'm taking a statistics course this semester, I thought it would be fun to run a simple analysis. Here's what I found:

https://ecomodder.com/forum/member-v...played-mpg.jpg

Using the quartile method to identify outliers, I removed two data: the two times when the factory display underestimated calculated MPG. The remaining 176 fills chart nicely into a normal curve.

Median = 3.0 MPG difference
Mean = 3.04 MPG difference

https://ecomodder.com/forum/member-v...played-mpg.jpg

Percent difference shows an even clearer normal curve, and again median and mean are very close to each other.

Median = 5.58% difference
Mean = 5.563% difference


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