Hi i have just recently purchased a 18.58.2 Expanda Outback. Looking at the tyre pressure card it recommends that between 310kpa and 345kpa cold (44.9 - 50) psi. Tyres are LT235/75R15. I decided to run 48.0psi cold as shown in my tyre gauge and these are the results hot after 2 hours of freeway driving mind you the day was 39 degrees outside. On the return trip home being a 20 degree day a week later the tyre pressure only went up 4 psi overall all round. Just seeing if any one else has been experimenting with their pressure.