and did you find this useful? Wouldn't it have been much better on your chart though instead of a spreadsheet?!
Not really because I merely need to press the top right button on this
and I get the "exact" fuel in the tanks, and I know the flow rate because it is on the display. I don't need range circles on the map, and anyway they are not circles if there is any wind ..... and at 90kt IAS the wind could be awfully relevant
when flying at 90kts, one does not have to be quite so accurate
I don't think the IAS affects the need for accurate fuel management.- except that a lower speed needs
better management if anything because, per hour of endurance, you have fewer airports within range. You are also less likely to escape bad wx if you are flying slower, and wx is by far the most likely reason for diversions (blocked runways that actually close an airport are very rare).