OP
OP
ksurfier
Well-Known Member
- Thread starter
- #76
Are you looking for minimum weight needed and best handling or are you trying to get best range and efficiency?
I believe low 60s will get best range and low 50s best ride.
if you want the same load as OEM then you can inflate to ~60 psi.
Range I would suggest is between 55-65 psi (cold).
A very general guide (If running 65 psi, best to check tread wear every 500 miles to make sure it's even, if not lower 5 psi...):
| For the LT tires: |
| 65 psi is 3,000# load per tire |
| 59 psi is 2,750# load per tire |
| 55 psi is 2,550# load per tire |
| 49 psi is 2,300# load per tire |
| 45 psi is 2,100# load per tire |
| Completely empty, 40 psi could support the vehicle (1,800# times 4 = 7,200#) |
| Fully loaded, 48 psi is recommended (2,225# times 4 = 8,900#) |
| Additional PSI will shrink the contact patch (this will increase stopping distance) |
| This is where the efficiency gain comes from and shorter CP means tire rolls more easily... |
| The bad side, too much/little and get uneven tire wear. |
Assume total vehicle weight of 7500#
Each tire supports roughly 1875#.
CPs at 50, 65, and 80 psi:
37.5 sq. in. (50 psi)
28.8 sq. in. (65 psi)
23.4 sq. in. (80 psi)
Let's assume CP as squares, so the CP length is shortened from 6.1" at 50 psi to 4.8" at 80 psi.
In theory this could result in a 20-30% increase in fuel efficiency.
| Tire | MPK |
| 48 psi | 1.7 |
| 55 psi | 1.8 |
| 60 psi | 1.9 |
| 65 psi | 2.0 |
| 70 psi | 2.1 |
| 80 psi | 2.2 |
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