https://www.fueleconomy.gov/feg/ratings.shtml
https://www.epa.gov/fueleconomy/basi...onomy-labeling
https://iaspub.epa.gov/otaqpub/displ...d=35113&flag=1
Quote:
2017 Ratings Changes
EPA is updating its method for calculating the fuel economy shown on new-car window stickers starting with the 2017 model year.
EPA periodically updates its methodology to account for changes in vehicle technologies, driver behavior, and/or driving conditions. The 2008 changes (see below) were broad revisions to the entire methodology that affected every vehicle.
The 2017 change updates some of the calculations used to estimate fuel economy. The new calculations are based on test data from model year 2011–2016 vehicles. So, they better reflect today's vehicle fleet of more fuel-efficient vehicles and advanced technologies such as hybrids and turbocharged engines.
Most vehicles are not affected by the new calculations. Some fuel economy estimates will decrease by 1 mpg, and a small number may be 2 mpg lower.
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The extra weight may have come from TSS-C and improvements for the small-overlap crash testing, but who knows really.