Fuel prediction weird

[Gábor]

Captains,

I am on a long range cruise at FL310 with torque 46%. I had full tanks.

Weirdly Garmin predicted at destination 40 gallons. By my calculations ( actual fuel consumption and ETA) I should have 120 gallons.

And this was always, I had a destination much more fuel then Garmin predicted.

What is the reason behind it? What I do wrong?

Thanks.

[Gábor]

Actually at my arrival the Garmin predicted 30 galls remaining, after landing I had 150 gallons remaining.

Quite big difference. With this I cannot plan my speed profile with high safety.

Thank you for your help in advance!

[Goran_M]

The fuel prediction is a Laminar bug, and they have been made aware of it.