http://www.motortrend.com/features/c...mbers_mpg_101/
I noticed the current issue of Motor Trend has an article midway through the magazine in which they detail how that they are now testing cars for real world MPG numbers.
What i found impressive is that the equipment that they use measures variables such as rolling resistance and aero drag, as well as emissions.
BTW, They really are including lots of geeky tech info when they test cars.
I wonder why that they stopped publishing the Cd values for cars like they did up until the early nineties.
Most manufacturers already know the Cd of the cars so it seems all they would have to do is to ask for the data.
Car magazines do sometimes print the Cdxa values for cars, but not as often as in the past.
That's too bad.