UMTRI: average sales-weighted fuel economy of purchased new vehicles in US dropped 0.2 mpg in May from April
The average sales-weighted fuel economy (adjusted EPA window sticker value) of new vehicles purchased in the US dropped 0.2 mpg in May from the level in April to 23.7 mpg US (9.9 L/100km), likely reflecting the slight reduction the price of gasoline, according to the monthly report from researchers at the University of Michigan Transportation Research Institute (UMTRI).
This level still marks an increase of 3.6 mpg US (18%) from the value in October 2007 (the first month of UMTRI monitoring).
|UMTRI average sales-weighted fuel economy. Click to enlarge.|
The average sales-weighted fuel economy is calculated from the monthly sales of individual models of light-duty vehicles (cars, SUVs, vans, and pickup trucks) and the combined city/highway fuel-economy ratings published in the EPA Fuel Economy Guide (i.e., window sticker ratings) for the respective models. For both monthly and model year averages, sales-weighted means were calculated.
The sales-weighted CAFE (unadjusted mpg) for May 2012 was 29.1 mpg US (8.1 L/100km).
UMTRI also reported that its Eco-Driving index for March 2012 was 0.83—a 17% improvement over October 2007. The University of Michigan Eco-Driving Index (EDI) is a national index that estimates the average monthly amount of greenhouse gasses produced by an individual US driver who has purchased a new vehicle that month. The amount of greenhouse gasses emitted when using internal-combustion engines depends on the amount of fuel used. The EDI estimates the amount of fuel used (and thus the amount of greenhouse gasses emitted) by taking into account two primary variables: the fuel economy of the vehicle and the distance driven.