Problems maintaining speed above FL210

[timtomairways]

before we start messing with the CFG. id suddgest flying with a Mach instead of IAS

In the FSX default 737 i use 280KIAS to climb between 10000 and 20000. at 20000ft 280IAS is Mach0.60, i then use Mach hold to stay at .60 as i
climb.

the speeds would be diffrent in the 767. but i would assume as simmiler procedure would be used.