Great ideas for fuel planning. For those that don't know, you can use many online flight planning tools to create your plan and export these to the iFly. Just save the plan as a GPX file to a thumb drive, put the drive in the iFly, and goto the Load Flight Plan form.
The VST (Vertical Speed to Target) will target the next airport in the flight plan (For this reason you should only put airports in your plan where you intend to land). You can also specify an altitude for any of your waypoints using the flight plan form, in which case the VST instrment will direct you to that altitude at that point.
-Walter