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A new report from The University of Michigan Eco-Driving Index:

The average fuel economy (window-sticker value) of new vehicles sold in the U.S. in September was 23.8 mpg – unchanged from August, but up 3.7 mpg (or 18%) from October 2007 (the first month of our monitoring).

For the description of the calculations and the recent mpg values, please visit

The University of Michigan Eco-Driving Index (EDI)–an index that estimates the average monthly emissions of greenhouse gases generated by an individual U.S. driver – stood at 0.80 in July.  This value indicates a record improvement of 20% since October 2007.  The EDI takes into account both vehicle fuel economy and distance driven (the latter relying on data that are published with a two-month lag).

Please visit for a brief description of what the EDI is, how it is calculated, and the current and recent values of the EDI.