[fjeffnutah]

I have been binge reading for over a week since I got my '11 FJ and everything says..... There is no cost effective way to increase power or gas mileage in the way of a modification. So our best best is to keep any extra weight to a minimum and Stock is the best MPG its gonna get.
Heavy bumpers, big tires, lifts, and anything atttached to the roof will only make it worse.