This article is from the Toyota Tundra FAQ, by Steve Yee with numerous contributions by others.
Recommended Tire Pressure is 26PSI in the front, 29PSI in the rear. This is
what is specified by Toyota. However, many owners have found that their gas
mileage has suffered from these tire pressures. In the 4x4 models with stock
tires BF Goodrich Rugged Trail T/A's, you can inflate your PSI to around 35.
 
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