I looked it up:
CX = Drag coefficient
I didn’t know what these values even mean, thanks for sharing the wikipedia link, very interesting 
Then they did two typos, one time in the SDK
and the second time in the Cessna 172 G1000 flightmodel.cfg, where they used the number 4.3
for the fuselage drag coef.
How is it even possible that the Cessna can fly with this high number? 