On the Vulcan the normal fuel uplift was full except when the calculated fuel burn on a short sortie would have given a landing weight above normal maximum. Typically air tests or displays would be fuelled to minimums for the sortie.
I suspect you are really looking for short leg comparison. For the short hop UK-Malta, once flown in under 2 hours, we still fuelled to max.
However I know an ex-RAF nav on Britannias with Britannia quit as all he did was fuel economics - minimum sector fuel uplift with expensive fuel - maximum cheap fuel uplift compensure with cost of carriage etc.