It is no wonder the photos are overexposed in the background. I suspect your camera is either metering at center or center weighted and metering a black surface !
This means when you put to something dark it will open the aperture to add light so in your case the car gets lighter but the background gets more washed out.
When looking for the best exposure, you need to realize what logic the camera is using when deciding the right exposure. For example, some cameras will allow you to meter something and then lock in that reading and then you can point it in the direction you want to shoot.
Changing the ISO, everything else unchanged, is not going to affect the exposure unless it was so dark that you did not get a full reading. Yes, ISO can affect quality (lower iso usually means less digitial noise).
When shooting objects like this, the best approach is just to bracket your exposure and then pick the best later or override. Or, you can anticipate this and just manually either slow the shutter speed or open the aperture to compensate.
It is always best to slightly underexpose (a little dark) and then fix it in sw than overexpose since you cannot recover the lost highlights.
Net, pay attention to what the camera meter is pointing at and anticipate issues when pointed at very dark or very light objects compared to the surroundings. Bracket your shots in constrast situations such as this.
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