I own a 2011 4runner and love it. Increased MPG would be my biggest reason to upgrade to a 6th gen. At 16-17 mpg with my current 5th gen (terrible), my dilemma would be wether the $50-60K for a 6th gen is worth a small mpg (<25 mpg) gain or spend $30K for a newer 5th gen with low miles? Any...