Cold Tire Pressure

If you've driven the car for a while how long should let the tires sit to get an accurate reading for the "cold tire pressure" settings printed on the fuel cap?
Last night I let the tires cool for about 5 minutes at the gas station before I inflated and checked the tire pressure and I hope that is enough. I set the front tires at 33 and the rear tires at 35. Each tire had a different pressure before I checked and inflated the tires so I'm glad I did that...
Oh and I used 78% nitrogen in my tires
Last edited by WEBSRFR; Jun 15, 2011 at 04:07 PM.
Can you recommend a really precise/good quality tire gauge?
If someone can recommend a compressor that has a good quality tire gauge built in, that would be even better!
Wouldn't it have been nice if Mercedes had an outlet coming out of the Airmatic pump for inflating tires?

http://www.amazon.com/G-H-Meiser-EZ-...8200788&sr=8-1
I also found this kit that I will buy just in case I am stranded some place far away from a service station...
http://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER

If you've driven the car for a while how long should let the tires sit to get an accurate reading for the "cold tire pressure" settings printed on the fuel cap?
Last night I let the tires cool for about 5 minutes at the gas station before I inflated and checked the tire pressure and I hope that is enough. I set the front tires at 33 and the rear tires at 35. Each tire had a different pressure before I checked and inflated the tires so I'm glad I did that...
Oh and I used 78% nitrogen in my tires

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