Thanks for you guys feedbacks...I got the exact 20 sizes that 4.6 has ..Front is 275/40/20 and the rear is 315/35/20... It used to be 215/50/17 I think...(FACTORY WHEELS) I have Toyo Proxies on them and I love the look and the ride is much more comfortable...It feels more like the sedan than an SUV...
It seems like somehow I need to get more power in there... I am not sure how much my gas millage will get effected!
I am just afraid my engine may go bad since the wheels are heavier.. ANy suggestions?
How about perfomance chips? Will it help?

Thanks again