13.5 mpg man that has to be the worst gas mileage I have ever heard of for a Tundra. Most people here are getting between 15.5 and 16.5 on average with there 4*4 v8 Tundra's. The worst I ever got was 14.7 and that was my second tank of gas from when it was new. I never got below 15 mpg ever since.
Do you have larger than stock size tires or something.
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