Absolutely fantastic image!! The range of colors and tones here is absolutely great. The way you have limited shadows and highlights by using HDR is also spot on. I think that this image has so many good things about it, that it is just hard to list them all. I love the composition, the timing, sharpness, detail, the idea with the gradient, the car itself, the lighting, the processing etc. etc. etc.
As usual, I do have a remark to make. My first suggestion, would be to try and use a small dark gradient on the bottom of the frame as well to balance it out a little bit more and maybe get more focus on the car itself. My second suggestion (a little bit random, but its what first came to mind when I saw this image) is to try and integrate the Subaru logo into the image. I would add it to the right hand side of the image, with quite low opacity. I think that it would work really well.