heres 1 for ya my car can sit in garage for 2 weeks or more and not loose a bit of air when i go out and boot it 1 or the other will go flat,ok some mite say you got a puncture well i have 2 new fitted toyo proxies and have done bout 200mls till today the right rear went flat after bout 1hr of booting about pumped it up in the garage and its still up and lost no air,i thought possibly it was the rim but it is different sides everytime .