iwilltry has write a tool, for measure the drag coefficient of cars.
available at
http://www.instructables.com/id/Meas...t-of-your-car/
After to have watched this one, I have modified it in order to greater precision.
The change, it is in the air density parameter: in origin, this value was fixed to 1.22 Kg/m^3, now, it is calculated in order of air density based on the climatic condition, and isnt' required to adjust it for altitude
for example, now, in Rome, with 15°C temperature, 48% of humidity and 1012mBar pressure, the air density is of 1.1735Kg/m^3.
New version, is avaible :
http://forum.ecomodder.com/attachmen...1&d=1206974721