The average fuel economy of new vehicles sold last month reached 24.8 mpg, a record high and a hallmark increase since the report's authors began documenting the figure.

November's number is up 0.1 mpg compared with the previous month's average, and the 24.8 mpg figure marks a jump of 4.7 mpg since Michael Sivak and Brandon Schoettle began collecting data about six years ago, Edmunds.com reported.

The report from the University of Michigan Transportation Research Institute also said that greenhouse gas emissions have remained steady for the fifth month in a row.

Beginning in October 2007, Sivak and Schoettle have garnered data and calculated average fuel economy for United States vehicles.

The "average sales-weighted fuel economy" figure is found by factoring in monthly vehicle sales combined with city and highway mileage ratings for each vehicle.

According to the institute, information was available for 99.8 percent of the cars, SUVs, vans and pickup trucks purchased last month.

UMTRI also released the newest Eco-Driving Index, which calculates average greenhouse gas emissions for the month; the November figure held steady at 0.8 for the fifth consecutive month.

The Eco-Driving Index, which is calculated using data from a new light-duty vehicle purchased that month, takes into account both the EPA-rated fuel economy of the vehicle and distance driven.

The Federal Highway Administration provides the data calculating average driving distance, which is adjusted based on seasonal variations, number of days in that particular month and the number of licensed drivers on the road.

The newest Eco-Driving Index is from September and indicates a 20 percent decrease in emissions compared with October 2007, when the report began.

Overall, the report on average fuel economy is good news for new car buyers who are worried about gas prices, according to Edmunds.

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