The University of Michigan Transportation Research Institute said the average fuel economy of all new passenger vehicles purchased in January 2012 was 23 miles per gallon, up 0.8 or 4% from December 2011. This includes cars, light trucks, minivans, and SUV's. Professors Sivak and Schoettle of the Institute also released a U.S. Eco-Driving Index, or EDI, which estimates average monthly emissions of individual U.S. drivers for Nov. 2011 at 0.86- this is down 14% from October 2007. The need to reduce reliance on imported oil for the U.S., Europe, China and India, the high price of oil, and the need to reduce automobile emissions to improve air quality, make improvements in average fuel economy and emissions per driver absolutely critical.