Question on tire pressure
 

I have an '07 Targa 4 with remote tire pressure monitors. This morning I started out cold with the factory recommended settings. 39 PSI in the fronts and 44 PSI in the rears. After several miles, I noticed the front and rear right tires each were 4 lbs higher than the front & rear left tires. This happens all the time.. Question.. Why do the right side tires always warm up much more than the left side??

Thanks in advance

Steve in Saratoga Springs, NY