F-150 tire size question
 

Hey everyone. I just was wanting to get some advice on what tire size would look good on a 1999 F-150 4x4 x-cab. I currently have 245/75r16 with factory aluminum rims. But I have bought American Racing Nitro 16x8 rims to replace the stock wheels. I want to upgrade tire sizes but don't wanna get so big that it throw my speedo off, decreases mpg, and affects the ride/drive. Would 265/75R16 look too small? Just looking for some advice or pics. Thanks