Thanks Nick, I'll bear that in Mind.
In a practical, real world, mental aritmetic, single pilot type sort of environment, it is probably more relevant to know the nm per lb. That way, you can more readily assess the range available for a given fuel quantity remaining. So 0 nm/lb rather gives the game away that you aren't going to get too far. No doubt I'm wrong.
I am intrigued by the fuel symbology in the S-92 and will be interested to see exactly how it looks, some day. On the EC-155 there is a real time fuel flow figure for each engine on the fuel page, along with the quantities and an endurance remaining. It's fairly simple stuff, but you can see in a real sense how the endurance changes with altitude, directly, rather than having to calculate it fom the the figures yourself.