I have a 4cyl 2001 Toyota Camry
It has the following rims.
I believe they're an aluminum alloy. I have a matching set of 4 DUNLOP tires rated for 44 PSI. I'll edit this post with specifics momentarily.
They were last checked for tire pressure 2,900 miles ago, one of the tires had a staple in it which punctured the tire. This leak was plugged and the tire was filled (as were the other three tires).
One tire looked quite low (although not so low that it was worrying me) - I decided to check the pressure and the tires were as follows.
Front-left: 30.5 PSI
Front-right: 20.5 PSI
Rear-right: 10.5 PSI (this is the one that looked low; it is also the tire which was plugged.)
Rear left - 35.9 PSI
I topped them all off to 40 PSI on Saturday. By today [Monday] the tire which was at 10.5 PSI is already down to 35 PSI. (All other tires are fairly stable.)
My question is: what is the normal rate of air leakage for tires / alloy rims? And how can I diagnose leaks around the rims?
I will have the tire itself checked, to make sure the area surrounding the plug is not leaking (and to ensure there are no new obstructions) this weekend.
Also, 10.5 PSI is quite low, is it low enough that I should consider that tire to be damaged? What are some signs of premature wear to look for?
All four tires are brand new, they were put on the car by the previous owner before I purchased it (2,900 miles ago; give or take).