A Ford Fiesta has two recommended tire pressures: 32 pounds per square inch (PSI) for less mileage and more comfort, and 36 PSI for more fuel economy and a firmer ride. Part of maintaining any vehicle is ensuring the tires have the correct pressure.
The proper air pressure for the tires in your Ranger will depend, first, on the year of production. Second, the air pressure will correlate to the power distribution to the wheels -- namely, whether the truck is two- or four-wheel drive. Other variations in model and cab length, tire size and the speed rating might also come into play.
It’s the most air pressure that should ever be in that tire. That should definitely be the advice you follow for a motorized vehicle. That said, trailer tire manufacturers like Goodyear are now recommending that you run the max pressure listed on the sidewall of the tire. A tire and loading sticker showing the vehicle’s original tires andWhile you can drive on highways with donut tires, it is safer to stay off of them as you will only be able to go about 50 mph or less. Check your donut tire pressure: The safe air pressure recommended for the donut tire is 60 pounds per square inch (psi). Since the donut tire sits for a while without being inspected, it is a good idea to check Similar tests were performed using the LT tires at 58 percent of their maximum sidewall inflation pressure. These low threshold values were selected based on the lowest inflation pressure at which a tire load is provided by the tire industry standardizing bodies. The results indicate that all 24 tires tested completed the test without failure." C3Zo3N.