Car drag coefficent vs fuel consumption link

[Jurgen M]

According to this equation, if you assume that the drag power accounts for only half the total power loss ($\frac{1}{2}\rho C_{d\ 1} A v^3 = P_{other}$), a drop from 0.26 to 0.22 will result in 0.5 L/100km reduction if the initial fuel consumption was 6.5 L/100km.

If your calculation is correct then they mean minus 0.04 ..

 

[Jurgen M]

I find this two text for same car:

"Every reduction of one thousandth in wind resistance pays: with a higher speed and lower fuel consumption. Even a 0.01 reduction in the Cd value represents a saving of 0.1 litres per 100 kilometres. "
and this text

"Good flow characteristics are tremendously important in this context, because if the Cd value can be cut by one tenthousandth, fuel consumption for the average customer is reduced by a tenth of a litre, and at very fast motorway speeds by as much as 0.4 litres per 100 kilometres."

one tenthousandth is 0.0001, that can be reduce consumption by 0.1Liter, something is wrong here..