I wouldn't run 80psi! Dodge engineers have determined that 65psi will get you the best all-around performance (handling, ride, tire wear, reliability). You can bump it up a few psi for a little better mileage but you will alter most of the things i listed (in a neg way)...
Run 65 all around. The only reason that the tires say 80 psi max is for the fact that they are load tires. If you have a heavy load, you can run up-to 80 psi to keep from squating. They will wear unevenly if you run them max all the time.
it all depends on the tires and how they are engineered on how much air pressure they should run and no one tire is the same exact thing. I run 80 in my goodyear wranglers which is what goodyear recommends but it all depends on your situation and tires my factories i ran 70-75
Having your tires inflated over what the door said may cause ride issues because you are on a firmer tire. I run mine higher because i never know when i am gonna put a heavy load on and i dont like soft tires for towing.
I run mine what the second door decal reads for unloaded weight
I think 45 in the rear and 65 in the front
I towed a extended cab 1997 4x4 5.9 truck today with these pressures and it was fine
i like the soft ride on the street since this is mostly used as a daily driver
It may slightly but I like the smooth ride it gives me. The mpg is so bad I dont think it it will matter much
it's a day and night difference of the ride quality from 65-45
the reason I purchased my DRW is becuase it had a better ride than the SrW
i did not realize why until I found the door pressure decal that the psi was set lower from the factory and that was why the DRW trucks had a smoother less jaring ride over the SRW
I find 55 in the rear and 60 in front gives a good ride and doesn't effect mileage. I use the tire pressure chart from Toyo and or Dodge and inflate according to the weight/inflation ratio.
If driving the freeways above 65 I inflate the fronts to 65,but leave the rears alone. Thin is carrying a cabover camper full time- been doing it for years.
I would not lower the pressure in the front lower than what it reads on that decal
that Cummins engine is very heavy. If I were to tow more than 10k I would up the pressure in the rear. the most I pulled is 10k and it does fine. I was a bit nervous yesterday towing that CTD at 40--45 in the rear tires but once I got going I did not feel a need to pull over and raise the psi.
I am about to hit 10,000 miles and the best I have seen at these pressures is about 20 mpg on country roads. I got about 11 mpg towing 10k yesterday
65 in the front, 40 in the rear for no load runs, any more in the rear and your tires will wear out in the middle, too much floatation on a dually with no load in the box. trust me, figured this out after two sets of tires. :$:
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