Don't try to understand it, just accept it
The Iveco Daily is quoted at 0.315:
It has a ladder frame chassis underneath with no apparent attempts at smoothing flow. It's much more aerodynamic than an E-Type Jags ~0.45, which basically matches the brick like aero of a Jeep Wrangler.
I think the mainstream media are to blame for pushing the idea that curvey looking designs are aerodynamic. It's an easy trap to fall into - but it seems that a certain level of boxiness is the way to go for aero. Look at how boxy the Nissan GT-R is for it's 0.27 CD.