tyres again

Adrian,
When you increase your tyre pressure for use on the highway, you don't get much heat build-up - that's the whole point: less heat build up becuase an infalted tyre flexes less in the walls so less wear. Thus, when you drop your pressure for sand the loss of extra pressure above guage reading when your tyre cools is not much of an issue especially when you consider the traction benefits.
Similarly when you drop pressure for rough roads any heat build-up will be less cause you are (hopefully) driving slower compared to the benefits in ride and cushioning the tyre from shock over rock etc.
With our medium size 4wd I use 40psi for highway, 25psi for gravel and rockhopping and 18psi for sand, but ask at a good 4wd tyre supplier for their reccommendations considering your tyres etc.
Hope this helps,
Camper

Thanks camper, understand now, Adrian.i like terra firma, the more firma the less terra, regards, Adrian.

We have the same car as you Ace & use the pressures that Camper uses. I dont increase pressure for hyway always 40 on tarRegards Bob
Where to next

I stick to the same Bob, as you mentioned earlier at a previous post,yours is a nice rig and a great colour, sounds pathetic doesn't it, who cares.i like terra firma, the more firma the less terra, regards, Adrian.

have a squiz at the SIME tyres website ( sorry i'm link illiterate) they have a really good burst explaning the 4psi theory and high speed high load running guidelines.Moo... everyone knows what a Jackaroo looks like :-)