U-Mich MPG study
According to a monthly report by Michael Sivak and Brandon Schoettle from the University of Michigan, the average fuel economy of newly purchased vehicles in October rose after declining in September, but did not reach a record high.

The average fuel-economy (window-sticker) value of new light-duty vehicles sold in the U.S. in November was 24.8 mpg, up 0.1 mpg from the revised October value. Vehicle fuel economy is up 4.7 mpg or 23% since October 2007 (the first month of our monitoring). For a description of the calculations and the recent mpg values, please click here.

Emissions

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 September (the lower the value the better). This value indicates an improvement of 20% since October 2007. The EDI takes into account both the fuel used per distance driven and the amount of driving (the latter relying on data that are published with a two-month lag). Please click here for a brief description of what the EDI is, how it is calculated, and the current and recent values of the EDI.

According to GasBuddy, the national average in November was 12 cents per gallon lower than it was in October. Americans tend to buy less fuel efficient vehicles when gasoline prices are falling. The average pump price in November according to GasBuddy was $3.24 per gallon, while prices in October averaged $3.36 per gallon.