Originally Posted by Dirt Bringer
The recommended tire pressure is a compromise for comfort and performance. The tires are rated to 44psi, and while they will likely change in shape somewhat by increasing air pressure within these numbers, it is not likely to be hugely significant to the point of changing the tread life. Traction is also a relative point depending on conditions. If you are running higher tire pressure you may experience slightly less traction but it is not likely to be a very significant difference unless the tire pressure is massively higher. I believe the Mazda 3 ( a lighter car) uses the same tires as this car but recommends a tire pressure of 36 or 38 on the door sill (had to adjust a friends tire pressures recently).
I disagree....but do as you wish! I still say that's too much. What do you consider "hugely" significant? Going from 32-38 PSI is increasing tire pressure by 20%....is that not "hugely" enough???