How often do you check your tire pressure or do you depend on your in car gauge. I have aftermarket wheels (HRE's). I hadn't checked my tire pressure in 2 weeks and found that 2 were at 29 psi and 1 at 28 psi. And I keep them at 30 psi cold. Also is it reasonable to have a little leak or pressure loss over 1-2 weeks? Thanks for the feedback.

 

I depend on the car gauge as a relative measure( i.e. they tell me if Im loosing air) and I calibrate the car gauge with a manual gauge when I do add air... so far the car gauge has been extremely consistent (7K plus miles) - I only use the manual gauge now when adding air cus its more convenient then poking my head into the car to check the pressure - besides old habits die hard...

As for loosing air over 1 to 2 weeks - Ill give the standard "depends" on what you consider little, what your driving conditions are, and what condition your tires and valves are at - From your data if you keep em at 30 and a week or two later saw em at 29 and 28 I would say its still within reaon but this topic has been subject of heated debate so you may get a lot of differing opinions

 

Do you read the gauge in the car cold, or is it more accurate after 2-3 miles of driving. Mine usually reads 28 all the way around cold in the garage, and after 2-3 miles reads 30 all the way around.

 

Yea that makes sense... the tires are warming up and as they do the pressure will go up* - mine read 29-30 cold and will reach 34-35 after a good 40 mile run - what your gauge is telling you sounds accurate.

Ideal tire pressure is 30 psi cold ( I think - its on the door panel) so if ya reading 28 in garage you could possibly add 2 lbs less you live in Butt Cold Country where 28 may be just fine ....

*ok ok for the guy out there screaming: you are wrong!: Yes my statement is only correct assuming nothing was done to remove moisture from the air being used to inflate the tire! All you nitrogen/helium/hidrogen junkies can back off now or catch me if ya can!

 

I check mine at least monthly and found they drop about 2lbs each.

 

I check mine about once a month. I always seem to have to add a little air.

 

I do the same thing since the DIC agrees with my digital guage. In my experience with leaking air, it depends on the tire or mounting. I've had tires that didn't need any air for almost a year. I used a other sets and had to add air about every six weeks. I guess it doesn't really matter as long as you don't have to fill them so often that it becomes annoying.

 

The temperatures are dropping from summer season into the fall and soon winter seasons. It is perfectly reasonable that the temperature at which the car sits overnight has goon down enough that the tire pressures have simply gone down with the ambient temperature.

 

I usually check the pressure in all my vehicles every couple of weeks. But 'always' after taking the cars in for service. They are never correct. I don't know what type of guage they use but I tell them not to touch the tires. They still do and I never have the correct pressure in them.

 

They always write 'inflated tires to 35 PSI' (which is the wrong pressure), but the actual value seems to be whatever they felt like. They also seem to make every tire different. Easy enough to fix of course.

 

[QUOTE=Mocoso] I only use the manual gauge now when adding air cus its more convenient then poking my head into the car to check the pressure - besides old habits die hard...

FYI This method dosen't work anyway. Page 5-61 in the owners manual states the DIC is updated every 60 minutes when the car has been stationary for more than 15 minutes.

 

I'm on my second set of tires (counting originals) and I have always had to add air every 3-4 Months. NOT MUCH, but I did add air. I use a seperate guage, which is very close to the DIC after "driving around the block"