idk where you got those graphs but they are way off... E rate tires typically hold 3600+lbs, at 80-85psi your graphs are showing tires maxing out at around 3000-3100lbs @80psi... thus throwing off your entire graph. having worked a both independent tuner shops and dealers, and been apart of several race teams and having also worked for a tire shop, i have been around tires of all makes types and styles, E rated tires can support the equivilant load of a P tire with lesser amount of psi. its in the construction of the LT type tire, now the same is true for D and C rated tires, although the gap is much less the lower the rating you go. also not all tires are created equal, one tire manufacture might say their D rated tire is able to hold 3450lbs while another manufacture will say 3500lbs... same is also true with the P tires as well, -and its not can also change within the same tire manufacture one style or design of tire might hold more or less than another(all in the same aspect ratio size)

just some food for thought. i dont know where you got the info, but its more than a little misleading...