Originally Posted by zacked
Going for ~70 F to ~30F would drop your tire pressure about 10 PSI, according to Gay-Lussac.
Yes.
T1 = 70F = ~530R
T2 = 30F = ~490R
P1 = 120psi
P1/P2 = T1/T2
P2 = T2/T1*P1
P2 = (490/530) * 120psi = ~111psi
In other words, a 40 degree drop in temperature won't make a damn bit of difference.