Diesl
Veteran Member
- Joined
- Dec 3, 2012
- Location
- Chicago
- TDI
- '78 Golf Diesel (long gone); 2012 Jetta Sportwagen TDI w/ DSG
My fuel efficiency went up from 35.5 mpg in February to 37.5 mpg in August, for the same commute. Here is the graph of five-tank average mpg vs average temperature. Until about March I extracted the weekly averages from the 'weatherspark' history plot, then I got lazy and just took the monthly average temperature. For the last few weeks in August I computed the average temperature for each tank from the daily observed averages.
The outliers (high points around 37 mpg/30-40 ºF) are from December 2012.
Using the five tank average gets rid of fillup variations. Maybe I should use daytime temperature averages.
The overall trend is a 1.4% increase in fuel efficiency per ten degrees F temperature increase, a 5.5% effect between winter and summer.
The outliers (high points around 37 mpg/30-40 ºF) are from December 2012.
Using the five tank average gets rid of fillup variations. Maybe I should use daytime temperature averages.
The overall trend is a 1.4% increase in fuel efficiency per ten degrees F temperature increase, a 5.5% effect between winter and summer.