Those BMW photos look fine to me with regards to focus.
Don't be afraid to go up to ISO1600 if required, this is where D-SLR's really excel over P&S cams.
I'm sure you know already but you need to match shutter speed with focal length to reduce blur from camera shake.
If I'm taking photos of stationery cars in the dark, without a tripod or IS then I would be using Tv mode and setting the shutter speed to the focal length.
During the day I use Av mode, with a wide aperture (F2.8 ) and long focal length to make the photo 'pop'
For Example
100mm F2.8
70mm F2.8
