One thing I see on the line a lot and definitely needs educating is the propensity for people to apply their own corrections to the takeoff perf, neglecting the fact that these are done as part of the calculation from the software. Stuff like starting with a variable wind of 5 knots and sticking in 10 knots directly on the tail. Congrats, you’re now calculating your takeoff perf with a fifteen knot tailwind which bears absolutely no relation to what’s going on outside in the real world (especially when you’d have to be very unlucky to get all of that wind directly on the tail in the first place). It’s not just discretionary fuel, these are the very basics here that people are going “belts and braces” so far they’re almost sabotaging the operation from an efficiency standpoint.