Just returned from a 900mi trip after having recall alignment and two new replacement front tires. Noticed that new front tires are not running as hot as before (fronts running 1-2 psi lower than rear at highway speed and temp...psi front and rear used to be comparable) and a 1.0-1.5 mpg loss in fuel economy. Started trip with all four tires at 36 psi cold. Anyone having similar experience?

 

I just bought my 05 Z with the RE 040. Should I be going back to the dealer asking for new tires?

 

Wierd, don't know.

 

WTF mate? Where did you get that idea? This guy is just being a little oversensative about his TPMS and his fuel mileage. Both of those numbers are well within any kind of error threshold. It could just be the difference in tread height from the new fronts and the old rears causing more heat in the rear tires and a higher psi and a 1 or 2 mpg loss in fuel economy could be caused by damn near anything.

 

Is it possible that your confusing "tire pressure" and "temperature". An under inflated tire will run hot (a major cause of tire failure). A properly inflated tire will run...well...at the proper temperature.

You’d like to increase fuel mileage a bit? Run plus one or two pounds “cold.”

 

Calm down I just didn't read it close e-nuf

 

Pressure and temperature are directly related. As the temperature increases so does the pressure. So when he sees that the front tires are running lower on pressure he is assuming that it is due to them running colder.