this is one way to avoid the stupid speeds at your new lower cruise lvl if you enter them as you reach them.
go to RTA page, then LIMITS, there you can enter new min and max speeds for VNAV. ie: min 270/,790 and 271/,791. you do not need the RTA point for this to work, and it is less hassle if you do not put it in.
PS: some drivers out there might enjoy the fact that the FMC will still show ECON for your speed selection when you do this....
