It'd be handy if there were a UI element or in-cockpit gauge showing instantaneous fuel consumption, either in pounds per hour or something more pragmatic like percent per minute. A neat additional feature would be a little sub-display showing estimated range and/or dwell time at current fuel consumption. It could be laid out to the bottom left of the current fuel gauge, showing something like:
FUEL 43%
RNG 187nm
END 20:40
I'd just appreciate this feature as someone who's really bad at estimating how much fuel I need on different planes, especially on the new larger map.