One problem related to engine knocking noise has been reported for the 2013 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2013 Toyota Tundra based on all problems reported for the 2013 Tundra.
When the engine starts it has a very noticeable knocking noise on the passenger side that never goes away. You put it in gear and you can really hear the engine knocking, and the knocking speeds up as you accelerate. Even after the engine warms up completely you can still hear it knocking(stationary, or in motion) . Also my gas mileage is horrible! I average about 12. 3mpg every tank. The best mpg I have ever seen is 13. 4 mpg average which is ridiculous even for a full size truck. I always loved Toyota vehicles and ever since I was young I always wanted a Toyota truck because I thought they were the toughest out there, but after owning this 2013 Toyota Tundra I'm disgusted.