I asked a similar question years ago and never got an answer really.
On my 86 syncro westy I run my 215/65-15 Michelin Agilis 51 tires at
maximum pressure (I think its 54 psi) all four corners. I haven't
experienced any abnormal tire wear and I find my handling good, and my
milage is better with the high pressure.

Chris

On 9/10/05, Jonathan Poole <jfpoolio@gmail.com> wrote:
> Howdy Listees,
>  my yokohama super vans have become too bald for the upcoming winter,, and
> are getting replaced by a set of michelin agilis' this week. Although I
> recall a recent discussion that voiced multiple opinions on the subject I
> wanted to see if I could get the expert consensus on what tire pressure to
> run with my setup which is an '82 ac westy which is moderately to heavily
> loaded considering that I full-time in it. I want to run at a pressure that
> is best for gas mileage and tire longevity as I don't do much off-road
> driving.
>  So what in ya'lls experience is the best air pressure for these tires and
> my van??
>  Thanks a bunch,
>  Jonathan Poole
>