Your take on tire pressure? (For fuel economy)

[MetroMPG]

Nope.

[Cani Lupine]

I've always wondered how speed-sensing TPMS systems work, since the distance from the hub to the ground changes when a tire goes flat, reducing the apparent diameter, but the circumference remains the same, so the linear distance should be unchanged.

[R01k]

You said it. The circumference of the tire itself won't change, but the distance from the axle to the ground will. This will affect the number of wheel rotations compared with the transmission or whatever is used as reference.

[3dplane]

The ones that sense rotation of the tire have a "simple" centrifugal force activated switch in them like a weight that swings outwards with wheel rpm and trips a switch then it starts transmitting the tire pressure via radio frquency every so many seconds.

[debburyl]

Best thing to do is just try it both ways. Take a trip for a couple hundred miles at the max air. Then on the way back put it at what it says on the door. And see if You see a difference. I know with the max air the ride will be a harder ride. And the lower amount will give you a softer ride

[debburyl]

That way you will see what kind of MPGs your getting with each setting. Also the key to better MPGs is to keep all four tires at the same pressure.

[Cobrajet]

I run mine at 45 psi. I like to find a happy balance between MPG, comfort, and tire longevity. If you inflate too much...just like inflating too little...you can cause abnormal wear patterns. Plus, if you hit a pothole or something with a wildly overinflated tire, you can actually blow it out instead of just getting a flat.

These cars LOOOOOOOVE to coast. So I'd inflate to whatever the tire manufacturer says is the highest safe pressure for the particular tire.

[deleted user]

At sidewall max recommended pressure the "soft" ride (as previously criticized) seems, at least to me, to become about perfect. Of all the cars I have run with tires at sidewall max, for over 100k miles, the Mirage handles it best. I might be a bit "prejudiced" though so take it with a grain of salt.

regards
mech