2011 Fit Loses Tire Pressure too Frequently

Although, unfortunately, I haven't been keeping track, my Fit low
pressure warning light will come on when at least one tire shows about a
six pound pressure loss. The other day, as has happened periodically in
the past, I found that all of the tires were 5-6 pounds low.

I've never owned a car with as small a tire as the Fit, and wonder
whether such losses are typical of small tires within 2-3 months of
previous restoration of pressure to 32 lbs. Our 2004 Toyota Camry never
loses more than a couple of pounds over the same period, or, for that
matter, any of the cars I've owned since my first new car, a '54 Ford.