PSI for my yokohama geolander tires on my 2013 Tundra Crewmax.

The tires always have less psi in them than recommended
according to the chart on the truck inside drivers door, 30 for front, 34 for rear-tires. I sometimes pull trailers around 4 to 5000 lbs.Depending upon who I ask about them looking low (and measuring the psi 27, sometimes more sometimes less) I am told they are fine. I get better mileage when they have 30-34 psi. Also the original tires had the nitrogen in them, what is best to use, my tire warning light comes on a lot. Please recommend what I need to have. Thanks, L

 

When towing, you should air up the tires. When I tow my travel trailer, I air them up to 34 front 38 rear (ish). If your tires measure at 27 psi, it will trigger the tire warning light.

Tires lose about 1 psi per 10degree drop in air temp. So if your tires are inflated to 30 psi during summer (90 degrees) and the temperatures drop to 50 degrees, then the tires lost 4 psi and your tire warning light may come on.

I would not bother with the nitrogen. I don't think the benefits are really that tangible. Most of what is in air is nitrogen already.

 

Nitrogen is a fad thing.....No tangible benefits for everyday users, so stay away from that garbage unless you're going to be racing your truck. Follow the recommendations found on the sticker in your drivers door jam for your sized tires. If you don't see your tire size on the sticker, call Toyota or Google it. Always air up if you're going to be towing! There are crazy formula's you can use to figure out the exact psi for your load or you can just add 2-4 lbs per tire. If you're using an equalizing hitch the weight will be spread to all four tires, but if you're just throwing a load on your ball, the back tires are taking the brunt of the load and may need an extra pound or two.