Particularly with light or light metallic vehicles, shape may be the overriding factor in determining ultimately how effective Veil, alone, will be.
On a pointy car like a late model Chevy Cavalier, we have heard of very good real-world experiences. On others, such as some Volvo's or a car like a late-model Chrysler 300, or an Envoy, not as good.
In these latter cases, while you will most certainly see a reduction from the maximum possible targeting distances, the amount of cloaking that Veil provides may not alone protect you when you get in typical targeting range.
In these cases, we would recommend the utilization of laser jammer and/or a black bra in combination.
What is the make and model of your vehicle?