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 vehicles sold in the U.S. in October was 24.8 mpg, up 0.2 mpg from September. This improvement likely reflects the net effect of two opposing trends: the improved fuel economy of model year 2014 vehicles, and the decreased demand for fuel-efficient vehicles because of the recent reduction in the price of gasoline. Vehicle fuel economy is up 4.7 mpg since October 2007 (the first month of our monitoring). For a description of the calculations and the recent mpg values, 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 August (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 October was 17 cents per gallon lower than it was in September. Americans tend to buy less fuel efficient vehicles when gasoline prices are falling. The average pump price in October according to GasBuddy was $3.36 per gallon, while prices in September averaged $3.53 per gallon.