During the high-volume car sales month of May, average window sticker fuel economy averages were up 0.4 mpg to 25.6 mpg.

This data is part of info tracked by Michael Sivak, Ph.D., director, Sustainable Worldwide Transportation at the school’s Transportation Research Institute, and the institute’s Project Manager, Brandon Schoettle.

The average mpg increase likely reflects the continuing high price of gasoline, said the researchers.


Since the first month of its monitoring, October 2007, the Transportation Research Institute says vehicle fuel economy is up 5.5 mpg.

For a description of the calculations and the recent mpg values, you can visit here.

The University of Michigan Eco-Driving Index (EDI) estimates the average monthly greenhouse gas emissions generated by an individual U.S. drivers stood at 0.78 in March (the lower the value the better).

A bit higher mpg (equivalent) score on the Ford Focus EV.

A bit higher mpg (equivalent) score on the Ford Focus EV.

“This value indicates that the average new-vehicle buyer produced 22% lower emissions in March than in October 2007,” said the researchers. “ 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).”

For a brief description of what the EDI is, how it is calculated, and the current and recent values of the EDI, please visit here.