I currently have 305/50/20 Cooper Zeon LTZ that are on their last leg. The Toyo MT(305/55/20) is by far my favorite tire, but the only thing that concerns me is how heavy they are. I will be going from a 54lb tire to a 72lb tire.

Will I see a considerable amount of power loss/mpg?

 

I forgot to mention that I have the 5.4 with 3.73 gears

 

I had 295x70x17 Toyo MT's on my last truck that also weighed 73 lbs. ea. Great tires but with the weight and the MT tread expect to lose 2 to 3 mpg less then the stocker's. My '04 also had the 5.4 and 3.73's with an Edge programmer.

 

Well losing mpg's and speed is obvious when adding weight. But, can you really resist such a sexy tire? lol