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Take THAT, flat tires 

Personally, I'd rather eat a 4-course meal in a gas station bathroom than use a gas station air compressor. You don't know where that air has been. What it's seen. And don't even get me started on the pressure gauges built into those things. You might as well ask your tire how much air is in it. The results would be about as accurate. There's a better way. Throw this handy dandy thing in your vehicle and live a life of air independence.