I am using a utillity called Little Navmap where it is a flight planner for flight simulators. To calculate fuel, you need Aircraft Performance data. The Little Navmap website don't have all aircraft performance files and would rather have to make the Aircraft Performance manually. I can fly the plane for the data but sometimes it is inconvienient. I am trying to find Aircraft Performance data related to fuel like Fuel Flow, Reserve Fuel, Usable Fuel, etc. Some sources don't have all the performance data and the websites or sources i visit don't have the fuel related data. If there is a source where i can find most aircraft performance data especially with fuel related data, it would be helpful because i can fill the data onto Little Navmap.