Canon A630

I have an older Canon A95, but I believe it has many of the same features and modes. Try setting the white balance to "sunny" and also you may want to set the Exposure Compensation to a negative value to allow less light into the camera which would help with overexposed pics (you'll have to play with this one since the EC can go from 0 to -2 in 1/3 increments).



Keep in mind that most digital pics require a fair amount of post processing to get the perfect balance of contrast, sharpness, saturation, etc...
 
I have a A620, so I believe it's similar. As the other's have mentioned, I try to lower the exposure so that it's not as bright. With a low exposure, it's easier to notice the deep, wet finish of the car. I generally use vivid mode, because it makes the cars look better :)



edit: And I also wanna say that usually I don't tone down the exposure that much. I find reducing it by 2/3-1 is probably the most you need to go. Later you can use photoshop to edit the levels or contrast (adjusting levels seems to give me better results).



I like this camera a lot, except for the fact that it doesn't have image stabilizer... It's not a picture of a car, but here's one of the best pics I've taken (yes, edited with photoshop afterwards) on a trip to Yosemite :)



img0212copyuf1.jpg
 
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