I don't know if this is going to help you or not, but we just scored a pretty nice 2011 Lx570 out of Dallas Tx with about 140k and absolutely no rust and I couldn't be happier.
The 100 and 200 series trucks are awesome and you could not tell by driving them if they have 100 or 200k miles on the clock.
Milage is hardly an issue with these trucks... buy one with better service history and no rust.
100%