Hi GoNavy:

___We were contemplating the pressure change over ~ 4,500 feet for more hours then you care to count as soon as we learned that his tire pressures had dropped so dramatically between CO and IL. John E-mailed me once he arrived back home with the following:

FL just before leaving IL.: 45.0 #’s. After his arrival in CO.: 46.0 #’s
FR just before leaving IL.: 45.0 #’s. After his arrival in CO.: 46.5 #’s
RL just before leaving IL.: 48.0 #’s. After his arrival in CO.: 48.5 #’s
RR just before leaving IL.: 48.0 #’s. After his arrival in CO.: 41.0 #’s

___There is no explanation as to the large decrease upon his arrival (~ 8#’s) given the increase (just .5 - 1.5 #’s) by comparison when driving back home. He is watching the RR for a possible slow leak however ...

___Tcamppb01, as a rule of thumb, tire pressures drop ~ 1 # for every 10 degree F drop in temperature.

___Good Luck

___Wayne R. Gerdes
___Waynegerdes@earthlink.net