From [0] (first) or wikipedia [1] (second), if you prefer. From mobile, so I hope you'll pardon any formatting issues
> In 2006, CAFE altered the formula for its 2011 fuel economy targets, by calculating a vehicle’s “footprint”, which is the vehicle’s wheelbase multiplied by its wheel track. The footprint is expressed in square feet, and calculating this value is probably the most transparent part of the regulations. Fuel economy targets are a function of a vehicle’s footprint; the smaller the footprint, the tougher the standards are. A car such as the Honda Fit, with its footprint of 40 square feet, has to achieve 61 mpg CAFE, or 43 mpg IRL by 2025 to comply with regulations. At the opposite end of the spectrum, a full-size truck like the Ford F-150, with a footprint of 75 square feet, only needs to hit 30 mpg CAFE, or 23 mpg IRL, by the same timeframe.
> Starting in 2011, the CAFE standards are newly expressed as mathematical functions depending on vehicle footprint, a measure of vehicle size determined by multiplying the vehicle's wheelbase by its average track width. A complicated 2011 mathematical formula was replaced starting in 2012 with a simpler inverse-linear formula with cutoff values.[9] CAFE footprint requirements are set up such that a vehicle with a larger footprint has a lower fuel economy requirement than a vehicle with a smaller footprint
From [0] (first) or wikipedia [1] (second), if you prefer. From mobile, so I hope you'll pardon any formatting issues
> In 2006, CAFE altered the formula for its 2011 fuel economy targets, by calculating a vehicle’s “footprint”, which is the vehicle’s wheelbase multiplied by its wheel track. The footprint is expressed in square feet, and calculating this value is probably the most transparent part of the regulations. Fuel economy targets are a function of a vehicle’s footprint; the smaller the footprint, the tougher the standards are. A car such as the Honda Fit, with its footprint of 40 square feet, has to achieve 61 mpg CAFE, or 43 mpg IRL by 2025 to comply with regulations. At the opposite end of the spectrum, a full-size truck like the Ford F-150, with a footprint of 75 square feet, only needs to hit 30 mpg CAFE, or 23 mpg IRL, by the same timeframe.
> Starting in 2011, the CAFE standards are newly expressed as mathematical functions depending on vehicle footprint, a measure of vehicle size determined by multiplying the vehicle's wheelbase by its average track width. A complicated 2011 mathematical formula was replaced starting in 2012 with a simpler inverse-linear formula with cutoff values.[9] CAFE footprint requirements are set up such that a vehicle with a larger footprint has a lower fuel economy requirement than a vehicle with a smaller footprint
[0] https://www.thetruthaboutcars.com/2012/10/how-cafe-killed-co...
[1] https://en.m.wikipedia.org/wiki/Corporate_average_fuel_econo...