https://www.transportation.gov/mission/sustainability/corporate-average-fuel-economy-cafe-standards https://www.transportation.gov/mission/sustainability/corpor

https://www.transportation.gov/mission/sustainability/corporate-average-fuel-economy-cafe-standards https://www.transportation.gov/mission/sustainability/corpor... MPG and GHG emissions per mile seem to both be part of the fuel economy standards in the US now.