On other types I've operated we used 'fuel priority' as a call to ATC. I'm sure it meant that as long as I can continue on my recovery unimpeaded I'll be fine, but if I get delayed (due to other traffic) I'll almost certainly be going below my minimum diversion fuel. We would even call it in the circuit if sent around too often for departing traffic or aircraft flying instrument approaches being given the runway from 4nm or so.