I keep my tires at 42/38 now - ran 42/40 for quite some time before
experimenting and finding a bit less "wander" on the freeway with
the lower back pressure.
I put 42 in the front the day after I bought my car (Oct 31.), and
when checked last week, they've lost 1 lb each, which could be
entirely due to temperature change (or they could have lost more
and it's warmer now). In any event, not fast enough loss to worry
about checking every single week.
I guess I'm just lucky
My MPG gauge also reads right on (for
each 1500 mile check I've made) as opposed to being biased
high, so my car experience is not the same as everyones.