Your tire pressure is almost ours changing, for evey 10 degres it drops or raises you lose about 1psi, and you can't just gain it back. I work at Discount tire Co. and I never check my air pressure
but it is somewhat important, but judging buy what you said you need and alignment- a rotation would not hurt you are supposed to rotate every 6-8,000 mils anyway. Hope I helped you out some!
-Jeff-
