Thanks for confirming. I suspect, but do not recall for sure, that the flight modelling engine in SkyDemon currently only concerns itself with altitudes and not flight levels.

Do you mean entries in the aircraft performance profile? If so, had you set the equivalent flight level for your actual flight?

Usually when people think there's an error in this calculation it's because part of the leg(s) in question is in a climb or descent. Please contact customer support if you think that isn't the case; they can talk you through it and if you send them the route and aircraft profile they'll be able to explain what you're seeing.

I have entered only one power setting (Max Cruise) with several levels.