Great to hear that IF is getting you all off the ground quickly and into the flying part of FSX
Using IF saves lots of time but does not mean you should throw away your complicated fuel calculator. For example the fuel is extremely accurate in IF once you found the Rage, remember this is the range of the sim aircraft flying in the sim. Running your addon Fuel and ETA calculator, you will now have more confidence since IF allows you to cross check the calculations made. I remember having no idea if the values were meaningful or not without IF's recorded flight fuel usage reports and the fuel estimates.
Note for [se] Taxi fuel burn time is supposed to be for adding time for holding as well
and is calculated at cruise burn, so 20 mins at half cruise burn = 10 mins. Although a bug in the briefing halves the taxi fuel burn time shown - fixed in [sf] - instead simply use 'Reserve Fuel Time' for added fuel time to get the briefing fuel time right (it's only 'Fuel Time' in the briefing affected and not the performance calculations). If you set zero times in Taxi and Reserve and make flights and set the Range suggested in the assessment de-brief, then rebuild the same flight and fly it in exactly the same way you will be able to see just how accurate IF's fuel and ETA calculation is.



