Who else tracks their MPG (any format)

For my 2006 Aveo names Brick we live in the United States of American so the Unit of measurement is Miles per gallon. I use the app GasBuddy to track my MPG and how much I spend in gas if I can figure out a way to export my information to share I will but in the mean time I have some screen shots from the app. I hope you all find this mildly interesting because I sure do.
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On average with my 2010, I get 21 mpg around town daily driven.

I use the app Fuelio, it does a similar job to the app you're using. It has graphs for your usage and patterns of improvement/worsening fuel economy etc. In South Africa we usually use litres/100km though. The quoted average for Aveos (up to 2009) is 7.3l/100km, and I'm getting an average of 7.8 (which is ~30mpg).