Are you using a tripod?
My hands aren't as steady as they used to be, so I always use the tripod. I've been wanting to get a small table top one, which would make it easier.
How close is the camera to the car?
Are you using the Macro setting?
Use the macro setting, if you have one, and keep the camera about 20"-24" away. I usually take one from that setting, and then try one after hitting the zoom once. If you only have digital zoom though, I would try not to use it. Too much digital zoom will result in a grainy picture.