Gas mileage is something you're just going to give up when you go to a larger and/or heavier tire. The looks and performance have to be worth the slight added cost. Mud tires, bigger tires, and heavier tires always make gas mileage decrease.

However, the biggest thing that irritates me is people NOT correcting their speedometers for the larger tires and then claiming some huge loss in gas mileage because they have 33" MTs instead of factory 32s. No, you lost maybe 1 actual MPG and the rest is because of inaccuracies.

 

Agree with KMAC. The relative loss won't be dramatically more just because its the Trail Grappler. Any significant increase in diameter, width, or weight will impact gas mileage. But like he said, if you recalibrate the speedo, it usually wouldn't be more than 1 MPG or so. Assuming you're staying within a certain size range increase. Even my 2010, I went from the stock size (little over 32") to the Trail Grappler (little over 34.5"), have a programmer to adjust performance and the speedo, and I'm averaging 14mpg over the course of a tank.

 

Ordered the G2's today and according to this, I'm just about spot on the speedo with the 305/50/20.

http://www.tacomaworld.com/forum/tir...5r20-305-50r20