It’s more or less automatized IRL. Anyway, a dispatcher will look over it and change altitudes if necessary.
I flown round the world with the TBM and I took max. FL whenever it was possible. When I came to legs where I was near the max. range of the TBM, I took weather and wind charts and tried to figured out the best suitable FL for max Range. I.E, i flown with the TBM over Antarctica and made a flight which was flown IRL. The IRL flight were 2 legs but I flown it in once because the destination Airport was not available in MSFS. In fact, I was almost at max Range and I had to play with the enroute wind. I changed routing and altitudes made small detours and finally I arrived with the last gallones of fuel.
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