I'm pretty sure I know which car because I know it's nice. And I remember talking to you about my friend with the silver one that's similar to yours.
A car like yours will stand out better against a lighter background like when you have pavement colored barriers between lanes on an interstate. Either that or a completely concrete road. I know of a few spots for both.
I'd like to see what rolling shots you've seen if you could post some links. That will get me thinking in the direction we need to go.
I can do better when I'm not driving a car since I can fully concentrate on the photo.
The hardest thing for me to figure out as a photographer is exactly what you as the client wants. I'm very good at figuring out how to shoot almost anything, so if you can show me something similar to what you want, it makes it really easy to make it reality. Feel free to get in touch to talk about it more, 615-512-5520. Weekdays anytime are the best time to reach me.