My '11 Ram calls for 35 psi. Most everyone I've seen in recent years does. A friend just purchased a new Ram, same set us my 11. Same tire size etc. His placcard calls for 39psi.
The tires on both trucks have a max inflation of 44 psi, however the load rating of the tire is max at 35 psi. They don't over any more load carrying when the pressure is increased above 35 psi, so the switch to 39 psi for the new MY doesn't have anything to do with load carrying.
I'm guessing Dodge increase the PSI to lower rolling resistance and squeeze out every last bit of fuel economy available since right now in time, fuel economy ratings on truck seems to be a pretty hot comparrison between the makers.
Do you think I am correct in my theory? Or is there any other reason why the pressure has been increased?
The tires on both trucks have a max inflation of 44 psi, however the load rating of the tire is max at 35 psi. They don't over any more load carrying when the pressure is increased above 35 psi, so the switch to 39 psi for the new MY doesn't have anything to do with load carrying.
I'm guessing Dodge increase the PSI to lower rolling resistance and squeeze out every last bit of fuel economy available since right now in time, fuel economy ratings on truck seems to be a pretty hot comparrison between the makers.
Do you think I am correct in my theory? Or is there any other reason why the pressure has been increased?