guys.. recently i did a small test and found that no matter how hard i push (urban cycle), my worst of all worst fuel consumption is not worst than 20mpg (i.e. 11.7 liter/100km).. and i am using 285/50V20'.. isn't using bigger rims will increase fuel consumption and rob away power? mine truck is the 4.5L twin turbo diesel version. what about you guys? chime in ya.. cheers! - jennifer.