Originally Posted by
autoflight
Fuel economy needs to be considerered alongside other considerations that could have far greater impact on overall efficiency of flights. ATC shortcuts can save fuel.
Missing a departure slot could cost hundreds of Kgs of APU fuel waiting for another slot. Being in a position to take a slot missed by another aircraft can save fuel ...
Doesn't this come within the OP's question? Being easy with the "right foot" in this environment includes understanding these factors and some individuals will be better able than others to judge the right time or turn of phrase to ask for that ATC shortcut or grab the slot that's just become available, won't they?