The tires are basically brand new. The shop cannot find ANYTHING leaking. They have checked all around the rims, the stem, the TPMS, soaked the entire wheel... nothing. If had in there to be checked about three times. And then last night, after sitting in our driveway for a little over a month (it's not our main driver) front right tire was flat at <5lbs and the front left was at about 10lbs. This has happened over and over again. It happened with previous tires. It happens after tire rotations. The driveway has about a 10° downward grade (maybe less) toward the street and I park the car backwards (facing down toward the street). Do you think it's weight on the front wheels? I am going to park it the other way around for a few weeks and monitor the situation. But that sounds dumb. Has anyone else experienced anything like this? UPDATE: I just read some accounts on Reddit that others had experienced this when parking on an incline. I had never heard of this before.

 

It happens after tire rotations. If you mean the tires at the front of the car lost air after rotating them you may have someone letting the air out. I don't believe how you park your car would make you lose air.

 

I am parking the other direction and still losing pressure. I have cameras - no one letting air out. Our other Honda never loses pressure. My next move is to have my shop remove all tires from rims and inspect and reseat. All I can think right now is faulty rims or faulty tires. They are nice Goodyear tires so IDK.