Tire wear

[scottminor]

40 PSI cold or hot?

[Olfart]

Look at the label on the inside edge of the driver door for tire pressure. Mine is 37 PSI. Always check presure when tires are COLD

[Scarsman]

Yes, you want to check them cold. It wont hurt to run a little higher PSI than what it says on the door. I spent many years in the tire industry, and have watched thousands upon thousands of tires wear under every imaginable condition. The manufacturer recommended PSI usually leans a little to the side of a soft ride. That is how the whole Ford Exploder/Firestone thing came to be. The biggest issue was they were only running 27 PSI in them.

In my experience I have found many times they wear better with a little more PSI. It can also give you a firmer, more controlled feeling, and may even improve MPG, albeit to a small degree.

Just my $.02 based on what I have seen first hand. YMMV.

[scottminor]

So the crazy thing... I had an alignment done, which was need and had them put 40PSI in them. My MPG before 10-11. On the way home 14-15.

How can there be such a dramatic change?

[mbdougl]

Did you reset the Mileage indicator? It will read higher for a while until is has more data.

[scottminor]

I did. It seems to have a short averaging cycle. I think I drove it enought that I saw it average down and up and down. I drive it again this eveing and check it again. How many miles does it take?

[mbdougl]

I have a completely stock 2004 and it will always come back to around 13.1 mpg within a few miles.