Tires: Tires Pressure/Tire Size by Type, passenger car tires, tire size calculator

Question
I have a 1993 Ford Aerostar. It is a 7 passenger window van. It is not AWD. It has the 4.0 litre engine.

It came with and calls for 215/75/14 "passenger tires". The recommended tire pressure on the door pillar is 33/front and 35/rear.

The recommended tires are difficult to find at a decent price and in stock, in the "passenger tire" line.

I replaced them with Uniroyal Liberator AT tires from Walmart, size 225/70/14. This is of course a truck or light SUV rated tire.

The new tires have a max tire pressure rating of 44 PSI. The passenger car line of tires has a max tire pressure rating of 35 PSI.

I checked the tire size calculator and realize my current tires are about 1% less in rolling radius than the called for tire. At 70 MPH this amounts to less than 1 MPH overead as far as the speedometer.

These tires fit the vehicle well and I have already used up a set on Dunlop 225/70/14 passenger tires on the vehicle.

My question is, what pressure should I run these new tires at? Should I stay with the door panel's recommendation, or run them at a slightly hire pressure?

I do not generally carry any added weight in the vehicle. It is normally just the driver and  full fuel.

I know according to "Hoyle", I should not have used an "SUV or light truck" type tire in place of a "passenger tire" as the manufacturer called for, but I did.

I currently have 35 PSI in all four of the new tires.

What would you recommend the tire pressure to  be, given the current circumstances?

I thank you in advance for your expertise and willingness to share your knowledge. I know I have already done a no, no.  

Answer
Ralph,

Just to clear a few things up:

Passenger car tires can come with a variety of pressures written on the sidewall.  What makes a tire a truck or SUV tire is the way it was designed not the size (although it's hard to find some size tires on anything but a truck or SUV), and the inflation pressure is still referenced off the vehicle manufacturer.  

Put a different way:  Passnger car tires can say 35, 36, 44, or 51 psi on the sidewall and so can tires for SUV's.

It turns out that both the sizes you referenced have the same load carrying capacity, so the inflation pressure recommendation by Ford still applies.