Chrysler says improved engines will help boost mpg (AP)

Cars averaging 23.8 mpg don't usually get much coverage on GreenCarReports — they simply aren't that green. In this instance though, that gas mileage figure doesn't refer to a particular car — it refers to every car sold in 2012.

  As an old runner I used to dream of 26.2 miles, but had to settle for 13.1 (now down to 6.2 in my dotage).

John Petersen submits:

In July 2011, the Obama administration announced the new Corporate Average Fuel Economy (CAFE) standards that will begin taking effect in 2017. The standards for U.S. light-duty vehicle fleets (passenger vehicles and light-duty trucks) will be 54.5 miles per gallon (mpg) by 2025, and they piggyback on the 2009 mandate for a CAFE average of 35.5 mpg by 2016, up from 27.3 mpg in 2011.

Carmakers are turning to new fuels, engines and battery-based technologies to meet new mileage standards.

Carmakers are turning to new fuels, engines and battery-based technologies to meet new mileage standards.

You most likely know by now that fuel efficiency is slated to double in new vehicles by 2025. What you may not know is how much that will cost you when you buy a new car in future years. Thousands of real dollars

Not long ago, the Obama Administration raised the federal fuel efficiency standards, known as CAFE, to an average 35.5 mpg by 2016. Yesterday, they announced the CAFE were being raised again to historically high levels. For model year 2025, the average fuel economy for cars and light-duty trucks will be set at 54.5 mpg. This will mean a nearly doubling of fuel efficiency compared to cars that are on the road today. The new policy was issued by the US Department of Transportation (DOT) and Environmental Protection Agency (EPA).