Greetings colleagues Virtual Pilots. I want to recommend a free program of calculation and planning the fuel as well as the route Flight time, for which not yet they have a good program for this. The best thing, aside from FREE, is that, it calculates the fuel for almost 60 different airplane models. In order to download it, you only must visit the webpage www.flightvirtual.com and there you can also download the user manual. (Very simple by the way)