I recently purchased a 2005 Ram 2500 Quad Cab Short Bed 4x4 with the Hemi. After my first fill up, I was averaging 16 mpg, which I understand is very good for this truck especially given that it has the 4.10 gears. However, after checking the tire pressure and finding that each tire was different, I adjusted each tire to the recommended light load pressure as per the sticker on the driver's side door (Rear: 45 PSI, Front: 60 PSI). However, after doing so, I found that my ride felt overly soft and bouncy, and that my gas mileage had dropped to 13 mpg. This leads me to believe that these "recommended" pressures are not, in fact, the best pressures for my truck.

What are you guys out there with similar trucks running for tire pressures?

BTW: My tires are the stock size, LT 265/70R/17, and Load Range E (Max Inflation 80 PSI as per the sidewall of the tire). Thanks in advance!

 

Are you sure those are the OEM tires that came on the truck? if not then that sticker on the door is useless.

What PSI so your tires say is max?

 

Although they are not the OEM tires that came with the truck, they are the same size and load range as the OEM tires. As per the sidewall of the tires, 80 PSI is the maximum pressure.

 

My A/T's call for 65 PSI on the sidewall and I run about 50

 

I run 60psi both front and back. I primarily tow with the truck so I don't want to air up and down all the time. The max load is 70psi on the rear but I don't get that heavy with what I am towing. The rear is a bit bouncing without any load.

 

I typically run 45 on 285/75s

 

I've had 7 full size trucks in my life and I've ignored the door sticker on every one of them. My rule of thumb has always been to run the tire at 80% of the max cold tire pressure listed on the side of the tire. I've had great longevity on my tires as a rule and seem to get about optimum fuel economy.

Run them "E" load tires at about 65 PSI...

 

Thus far, everyone seems to recommend having the same pressure in all 4 tires. Is this a good choice? I do not tow or haul on a regular basis and have no issue increasing my tire pressure when I do.

Also, what does everyone think about 70 PSI all around?