I am a big believer in maintaining tire pressures. Last year I broke down and bought a small air compressor with a long hose with a gauge at the end (see links). Not expensive but makes checking and filling tires SOOOOOO much quicker and easier. I have 3 vehicles that I check every 2-3 weeks and there are always a few tires that need to be topped up by several psi.
I've also found the compressor is great for other small jobs where compressed air is needed in the garage...including blowing dust out of vents, etc. when detailing vehicles!
Campbell Hausfeld 6g Compressor and Inflation Kit | Canadian Tire
http://www.canadiantire.ca/AST/brows....jsp?locale=en