On a similar note, I noticed my front tires were looking low, and checked and found them at 90lbs, so I tried to top them off with the aux air, took forever to get them to around 100lbs, but couldn't get them any higher. Is it just my aux air is weak or does everyone experiance this? Does the low ambient temprature cause the air pressure to drop, causing me to overfill my tires when the temp goes back up?