Typically when buying an air compressor for your car you'll want something that is 12V, which means it can be powered by the cigarette lighter adapter in your car. The air compressors in this article draw power from a 120V wall outlet so aren't good for auto use. They can, of course, fill car tires or help wash a car that's in your garage or driveway, but they won't help fix a flat tire when away from home.