I know that checking tyre pressure is a very important thing before making long journeys. However, I have no idea how frequently I should check my tyre pressures. For example, If I travel round-trip 20 miles, do I really need to be panicky and check my tyre pressure or do I just leg it?
P.S. I know that modern cars have the tyre pressures indicated both in user handbook and the lower side of the driver door (where it touches the middle frame).
Also, any recommendation to what tyre inflator equipment I should keep for my personal use ( apart from relying on the Gas Station ones)?