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Actually, I can only recall ONE thread where someone asked what tire pressure they ran with.
To answer the question, I have no idea. It would depend on when/where/how you drive, the weather, how fast you are traveling, and how heavy your car is.
I personally roll with 32 psi. Not sure why, but I like the number 32.
My dealer likes to keep 35psi, but the manual recommend 32. What is the optimal pressure to balance the tire wear out and gas consumption?
What the manual says and Tire Rack agrees. They even recommended the same pressure when I went to 225/40-18's because the air chamber for that profile tire is the same size and they tested it with good results. Rides great and my wear is very good, so I would tend to think they're right in their recommendations.
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I believe when the dealer checked my tire pressure, they actually lifted the car. The tire pressure was measured without consideration of the car's self weight. When I did the measure, it included the car's weight.
Although possibly we both measured by 32 psi, the actual tire pressure was higher without consideration of the car's weight.
Conclusion:
If your dealer check the tire pressure during tire rotation, make sure you check it again with the car on the floor.
I think off ground or on the ground matters. Just like a balloon, if you press it, the internal pressure should increase to again the the pressure from outside.
I've never heard of that method of measuring tire pressures before.
But I do know that it's important to take your tire pressure readings when they are cold, or have been sitting overnight to ensure the best possible accuracy.
They say the reason it doesn't matter is how the tire kind of bows-out at the bottom when you lower the vehicle. For that reason, the internal dimensions of the tire doesn't really change, which obviously, pressure is totally related to the area that it has to fill up.
I know this is true because on aircraft I work on (which weight in at 120,000 pounds), the pressure doesn't really change on them either.
What the manual says and Tire Rack agrees. They even recommended the same pressure when I went to 225/40-18's because the air chamber for that profile tire is the same size and they tested it with good results. Rides great and my wear is very good, so I would tend to think they're right in their recommendations.
Also depends on the tire that came on the vehicle. I always run a little higher than the manual recommends but less than the pressure max on the sidewall. I find gas mileage and response improve. Increased tire wear has been neglible in my experience.
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What is the typical tire pressure of 2009 rolla
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