Exactly as the title says, since the rules in drift crisis for vellsencraft ltd. say that whilst their augments cost less, they consume "100 credits' worth of thasphalt... to keep functioning"
(I used an ellipses to mark the removal of the reference to page 50 from the quote)
The vellsencraft entry references page 50 saying to look there for more information, but the rules for thastheron and by extension thasphalt on page 50 don't actually mention how often a vellsencraft augment needs to be supplied with thasphalt.
