Edmunds is making a big deal about the difference in EPA "window sticker" vs CAFE fuel economy standards. Read about it here. They're reminding us that the window sticker fuel economy is a (downward) adjusted number which takes into account more typical customer usage (like A/C). The CAFE city FE test (FTP75) is run on a chassis dynamometer, at 72F, with a cold engine, with A/C off, and various other standard conditions.
The "two standards" aren't really two standards, the legal standard is CAFE FE (unadjusted). The fuel economy labels for consumers are required by law, but cars are not regulated to that number.
Edmunds does provide a handy list of vehicles that might meet the 2016 standards today, and not surprisingly, they are all sub-compact and compact cars, and hybrids.
This is instructive. In 2016, affordable cars which meet the new CAFE standards will be compact cars. Anything larger will be much more expensive, as carmakers will have play tricks such as reduce weight (aluminum, carbon fiber), add hybrid drives, add gasoline engine technology (turbo direct injection), or perhaps clean diesel.
Today, the average car is a "midsize" vehicle, somewhere between a Toyota Camry and a Honda Civic. In 2016, I suspect the average car will be a compact, about the size of a Civic.
CAFE vs. EPA You On Here » CAFE vs. EPA
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