Look on the tire sticker on the drivers side B pillar. Am I correct in assuming everyone's Expy has that sticker? If you're running the stock size/type it'll tell you the proper pressure. For my '04 Eddie Bauer it's 35 psi. I'm thinking that pressure is for curb weight. I believe the 'max pressure' listed on the sidewall of the tire is for that tire at it's highest weight rating.
I just drove mine up from Florida (to New Jersey) and I didn't have a tire pressure gauge or compressor so I took it to a Wawa and put in 40 psi by the pressure gauge on the pump Wawa provides for free air. Assuming the pressure was close it was too much and made my Expy ride like a truck . . . oh wait . . . it IS a truck - sorta.
Yes, there is a sticker, but...
You are correct that max PSI is at it's highest weight rating. Probably other factors why Ford said such PSI.
I'll still go with 40F, 38R and watch the tread wear patterns.
Lol, I call it a truck, but it's actually considered a Sport Wagon per State Farm (and registration?, I'm lazy right now and don't want to walk out to my 'truck'.
It has to do with the rear cargo windows from what I recall reading somewhere a while back.
