The Greenmeter, recently released by Hunter Research and Technologies, is an iPhone application with a mission: to keep track of your cars carbon footprint and fuel efficiency .
The program uses a multitude of variables to make its calculations, including weather conditions, cost of fuel, and vehicle weight.
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Source:
http://cleantechnica.com/2008/10/30/new-iphone-app-measures-your-cars-environmental-impact/
