I started at 60/60, and am coming down in small steps to find out what I can work with.
I want to find an optimum setting that I don't need to change, so I can remove the switch from my bars. I have several routes, and want to make sure I can still do them without getting off and having to push!
Once I have it figured out, I'm going to set Eco to something like 15/15, have Trail at 35/45 (or whatever I finally decide on) and leave Turbo as 100/100.
The bike always starts in Trail, so I'd never need to change it. I could swap to Eco if I needed to conserve power at the end of a ride... and keep Turbo in the event I have something really extreme to climb!
That'll be another cable off my bars to make them tidier.