Gas Mileage Update

About a year ago I wrote about tracking the gas mileage for my Mazda 626 and the price of gas here on the eastside of the Seattle metro area. Here is a quick update so you can see how both have changed over the course of a year.

Keith's gas mileage (2007 update)
Mileage Definitions

The "AVERAGES" row above is cumulative from June 2004 when recording began. Below are the averages restricted to the date range displayed in the chart above (Oct 16, 2006 through Sep 12, 2007).

mileage 2007 past year average

Comparing this past year to the overall numbers:

  • I go slightly longer between refills (27.5 vs. 23.9 days) and put more gas in my car (12.6 vs. 12.0 gallons) each time.
  • My mileage (MPG) average of 25.6 continues to trail the historical average of 26.8 since moving closer to work. Considering how much closer we live (5 mile vs. 17 mile one-way commute) my MPG average remains very respectable. (Hypothetical high-five to the Mazda engineers.)
  • All the "Price Per" entries (PPG, PPM, PPD) are more a reflection of the increasing cost of gas than my driving habits or car. Below is a chart showing how gas has increased almost 50% in our area between June 2004 and Sep 2007.
Seattle Gas Prices 2004 to 2007

Note that May is still the worst possible month to take a road trip. I am considering making May my official public transportation month.