I'm interested in possibly buying an XLE. I know the EPA rates it worse than the LE. I understand on the v, package 5, the real world diff is not very much at all. Is the epa rating fr the xle compaably correct to the le? What are people getting on each? Also, lets discuss the possible reasons as to why it is ifferent? Is it wheel size? weight of power seats? brand/model of tires? something else?