Good day everybody
For what it is on other various topics, the conclusion is it's not precise to say the range of this 767 as it depends mostly on the Cost Index setting.
I didn't find it in the manuals, but is there an aprox? is it from the real 767 (around 5,505 nm)?
I find the CI at 73 just fine BTW.
Personally, the longest flight I've done with this 763 is THU (Greenland) to HNL, making 4,146.6 nm in 8h 45m with 132,039.5 pounds of fuel and just enough fuel left to make a go-around.
I can't get down the CI from 73 or I just never could get FL350+ though, even with a reasonable payload weight.

For example, if I want to make it from SCL (Santiago de Chile) to SYD (around 6,200 nm), is it smart/alright to set your CI at whatever for climb and bring it down up there for an economical cruise at aprox .78 Mach to see how it does? Is this situation just experimental?

How do your long-range flights perform?

Thank you in advance.