Espen wrote on Feb 21^st, 2011 at 9:03pm:

... Another thing I have wondered about is that of all the add-ons I use, 737PIC, LD767, PMDG747 and Maddog the CS757 have very low landing speeds according to the FMC. I find that a little odd. I would suspect that MD82 and B737 was supposed to have the lowest landing speeds in general. ...

The 737 and the MD82 have very high landing speed in real life compared to the size of the plane. I dont know about the 757, but it wouldnt surprise me if it had lower vref at all