What Is The New National Fuel Efficiency Standards?

What Is The New National Fuel Efficiency Standards? What qualifies as fuel efficient, then? Anything that is listed as less than 6-litres/100km or more than 16.5km/1-litre is considered to be pretty good. The first (and most common) reference is litres per 100km (litres/100km). How is Cafe calculated? (CAFE standards are calculated by a production-weighted average