Hucho free online
 

This may have been posted elsewhere,but it's Hucho's Aerodynamics of Road Vehicles,2nd-Edition,1986,free online.
OOOOps!
Actually they want you to buy it,but they show quite a bit of it.
Can't link it.Sorry!

Awwww.... :(

In my best Maxwell Smart voice imitation: "Missed it by THAT much!"

Aerodynamics of road vehicles : from fluid mechanics to vehicle engineering (eBook, 1987) [WorldCat.org]. This site may give you local college libraries that have the book on hand. State schools are more likely to let locals borrow materials than private colleges. They may also have information on subscription services where you could purchase it as download.

Amazon has 16 used (4th ed.) books available from $76.

https://amzn.to/2PKZKXz

Right click and choose "save link as"

AERODYNAMICS OF ROAD VEHICLES Wolf-Heinrich Hucho

VEHICLE AERODYNAMICS Introduction, Alessandro Talamelli KTH-Mekanik University of Bologna

Aerodynamics Of Road Vehicles: From Fluid Mechanics
To Vehicle Engineering ([Proceedings] / SAE)

Road Vehicle Aerodynamics By A. J. Scibor-Rylski

Aerodynamics of Road Vehicles –
a Challenge for Computational Fluid Dynamics
Wolf-Heinrich Hucho 2003