> The more aerodynamic the car is the less splats there should be, as the bugs are more likely to be carried by the flow of air around the car, correct?

incorrect

As I've pointed out in another comment, research has shown [0] that counter-intuitively "modern cars actually hit slightly more insects."

It's a reasonable hypothesis, however what this research shows is that we would have expected to see more dead insects on cars had populations remained stable.

0. https://www.theguardian.com/environment/2020/feb/12/car-spla...