Of course, none of this does any good if you have a slow leak and don't check your pressure.
I thought I checked and inflated a month ago, but maybe it was more and maybe the cool weather is exacerbating my slow leak. For at least a week my steering has been sluggish, my power steering belt has been screaming, and the tires have been squealing around turns like they're misaligned.
Well, I finally noticed my right front tire was visibly very low. 12psi! Left front looked mildly low...16psi!
I paid 75 cents to inflate them to 50psi at the first gas station I saw. They're getting replaced soon so I won't worry about the increased leakage rate.
I imagine my fuel economy has suffered. I've been blaming it on my driving.