I was just wondering if you guys put the airpressure what is mark on your sidewall of the tire or what the manufacture calls for on the inside of the door. The dealer did what was mark on the sticker on the door which was 45 psi, but the tire says on the side wall max 80 psi, so what's up which way do I go. the tires look really low on air, so please help.

Thank You.

 

Good question. I would like to know this myself. I'm running 80psi. Bump

 

It all has to do with load ratings. My door has higher pressures listed than 45, but generally speaking the lower the air pressure, the softer and more comfortable the ride. Keep in mind that the weight limit shown on the sidewall is for the max. pressure listing, so if you want to haul around a bunch of weight, more air is better to prevent tire failure.

Higher tire pressures will give you a stiff, bumpier ride, but will increase fuel mileage and allow you to carry more weight. Also if you're running cheap tires, 80 psi will make the center of your tire go bald faster then the outer edges. If you're just running around empty, the best thing to do is experiment with different tire pressures and see what gives you the best ride for the MPG. Just make sure to keep the pressures between the min. on the door and the max on the tire.

Personally 45 psi sounds like too little to me under the 7.3 motor for the front, and I wouldn't keep the back any lower pressure than the front.

I've got one of those big ranch hand bumpers in front, and haul trailers or loads enough to keep mine on the higher side, but I'll run my fronts anywhere from 60 - 70 and backs from 70 - 80. I've tended toward the higher pressures for better fuel economy with the current cost of fuel.

(How's that for a long winded answer?)