Seriously, no magic PP. I'm quite certain I may be the worlds laziest post processor I use Canon DPP, then Photoshop elements 9 to resize & sharpen.
I've just started shooting in raw, as I'm still learning my new camera, and all I do is set my own picture style. +1 on contrast & saturation, leave the sharpness alone. That's it.
Import into Canon DPP. It's great, because it remembers your camera settings, and the colours it produces are fantastic. To my eye anyway. I can't get close to the colours of DPP in Lightroom, even after ages of fiddling around.
Maybe lift the shadows a touch, or adjust the exposure a little to suit. That's it. Open in elements 9, resize and sharpen. About 40% sharpening, 0.8 radius & 1 on threshold.
I find the best way to get nice photos, is remember the basics. Get the initial exposure as close as possible to correct. Don't shoot into the Sun, morning and afternoon light is nicer, and focus correctly.
Hope this helps
Thanks for the tip. Love your car shots.