If anyone is looking for a tire inflator, I recommend a li-ion one rather than one that pugs into the 12V cigarette lighter plug. I have owned a number of portable inflators in my time, and have always had problems with the 12V ones... or at the very least they are inconvenient. The li-ion ones are smaller, lighter, and inflate faster. Also, most of them allow you to set the desired pressure, and they will automatically stop when it is reached. I know some 12V ones do that as well... but I will never go back to a 12V inflator after using li-ion ones.
I have bought three of them... one for me, one for my wife, and one for my father. Here is the one I use: Amazon link to FORYOU inflator
Not only great for the car, but we use it on our bikes, sports balls, etc. It's hard to believe how much it can do just on the internal battery.
Last winter we drove my wife's car on a ~1,600 mile road trip to visit family. One of her tires developed a slow leak, so I had to top it off a few times. Her 12V inflator stopped working, and I figured out that it was due to a broken wire. The looooong 12V wire with a cigarette lighter plug on the end goes into the body of the inflator and there was just too much strain on it and it broke. Fortunately, I had my cordless soldering iron in my tool bag. In a Wall-Mart parking lot, I was able to take it apart and solder the connection back together. I replaced it with a battery-powered one when we got back home.