How are you rotating your tires? I rotate them like this and my bfgs wear evenly. Swapping sides changes the direction of rotation and improves the wear pattern.
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99 Montero....15mpg! Sold (so sad)
02 Jetta TDI....48mpg!
03 2500 Ram QCLB Cummins....18mpg
02 2500 Yukon XL, We out grew the montero, at least it has one locker.....13mpg (sold)
01 montero limited