first the report...

current psi in my 2005 MCS measured cold

Left Front 28 psi
Right Front 26.5 psi

Left Rear 27.5 psi
Right Rear 27.5 psi

Now... I dont know for sure but I think they were under inflated when I had Nitrogen put in about 3000 miles ago...

The tire shop that did I have been using is not the best. I am now going to get the tires inflated very next time I drive it - we (car and I) are going to the new tire store...

Here is a question for the brainiacs at NAM....

according to calculations raised by this post (read Post #3),

http://www.northamericanmotoring.co...ead.php?t=50149

If I have 1 driver weighing 200 pounds

I should have;

42 psi in the fronts and 25 in the rears

Why does the sticker on the door sill state I should have 38 psi in all four tires when I know the fronts have a lot more weight on them...

I have the Pirelli Eufori stock run-flats with max wieght per tire spec of 1102 @ 52 psi....

(the F/R weight bias for the 05 mcs is 63/37 if you get into the math from the other post...)

Why the difference between 38 psi in all four wheels and the calculated 42 psi in the front and 25 psi in the rears ?

Is 38 all four wheels for 4 people with a not to exceed weight of 816

Thank you for any help in understanding this..... [img]images/smilies/thumb-up.gif[/img]


btw...

Why it Pays to Watch Tire Pressure
1. One fifth of all tires are up to 40 % under their correct pressure.
2. A 10 % drop in pressure cuts a tire's service-life by 15 %.
3. For each fall of 0.21 bars under correct tire pressure, fuel consumption increases by 1.5 %.
4. 75 % of all flat tires are the result of insufficient pressure or a gradual loss of tire pressure due to a leak.
5. Tire problems are the third most common cause of vehicle breakdowns.
6. In the U.S., around 250,000 accidents a year can be traced to insufficient tire pressure.

Source: Schrader-Bridgeport International