Simply that, RWD? But you can see my logic.....extra weight at the front seems to dictate a firmer pressure. I just checked by tyre pressures (my car is a recent second-hand purchase) and the pressures were about 30psi all round
perhaps this is why the rears seem to have worn a little more than I expected. rears down to about 3mm tread, with 10k miles.
Off to inflate them!