Maybe it is the traditional answer because it is the correct answer
If you have no aux tank then you don’t need a full 4% correction. If you are flying a standard 3 tank classic then the greatest adverse fuel trim change is from full wings (9,200kg) to 6,500kg. This gives a change of -2% or a reduction in manoeuvre altitude capability of 100ft.
Remember that if you are scratching about for that last 100ft you probably shouldn’t be up there - especially if there is any turbulence.
S&L
PS Say hello to JP for me